medium
5.3
CWE
772
Advisory Published
Updated

CVE-2024-20493

First published: Wed Oct 23 2024(Updated: )

A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. A successful exploit could allow the attacker to deny authentication for Remote Access SSL VPN users for several minutes, resulting in a temporary DoS condition.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.4
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.5
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.6
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.7
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.8
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.9
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.10
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.11
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.12
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.13
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.14
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.15
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.16
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.17
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.2.3.18
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.4
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.5
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.6
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.7
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.8
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.9
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.10
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.11
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.12
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.13
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.14
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.15
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.16
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.17
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.4.0.18
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.4
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.5
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.5.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.5.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.7
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.7.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.6.7.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.7.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.7.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.7.0.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=6.7.0.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.1.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.2.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.4
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.5
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.6
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.6.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.0.6.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.1.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.1.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.1.0.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.1.0.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.0.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.3
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.4
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.4.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.5
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.5.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.5.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.6
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.7
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.8
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.2.8.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.3.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.3.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.3.1.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.3.1.2
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.4.0
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.4.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.4.1.1
Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software=7.4.2
Cisco Adaptive Security Appliance Software=9.8.1
Cisco Adaptive Security Appliance Software=9.8.1.5
Cisco Adaptive Security Appliance Software=9.8.1.7
Cisco Adaptive Security Appliance Software=9.8.2
Cisco Adaptive Security Appliance Software=9.8.2.8
Cisco Adaptive Security Appliance Software=9.8.2.14
Cisco Adaptive Security Appliance Software=9.8.2.15
Cisco Adaptive Security Appliance Software=9.8.2.17
Cisco Adaptive Security Appliance Software=9.8.2.20
Cisco Adaptive Security Appliance Software=9.8.2.24
Cisco Adaptive Security Appliance Software=9.8.2.26
Cisco Adaptive Security Appliance Software=9.8.2.28
Cisco Adaptive Security Appliance Software=9.8.2.33
Cisco Adaptive Security Appliance Software=9.8.2.35
Cisco Adaptive Security Appliance Software=9.8.2.38
Cisco Adaptive Security Appliance Software=9.8.2.45
Cisco Adaptive Security Appliance Software=9.8.3
Cisco Adaptive Security Appliance Software=9.8.3.8
Cisco Adaptive Security Appliance Software=9.8.3.11
Cisco Adaptive Security Appliance Software=9.8.3.14
Cisco Adaptive Security Appliance Software=9.8.3.16
Cisco Adaptive Security Appliance Software=9.8.3.18
Cisco Adaptive Security Appliance Software=9.8.3.21
Cisco Adaptive Security Appliance Software=9.8.3.26
Cisco Adaptive Security Appliance Software=9.8.3.29
Cisco Adaptive Security Appliance Software=9.8.4
Cisco Adaptive Security Appliance Software=9.8.4.3
Cisco Adaptive Security Appliance Software=9.8.4.7
Cisco Adaptive Security Appliance Software=9.8.4.8
Cisco Adaptive Security Appliance Software=9.8.4.10
Cisco Adaptive Security Appliance Software=9.8.4.12
Cisco Adaptive Security Appliance Software=9.8.4.15
Cisco Adaptive Security Appliance Software=9.8.4.17
Cisco Adaptive Security Appliance Software=9.8.4.20
Cisco Adaptive Security Appliance Software=9.8.4.22
Cisco Adaptive Security Appliance Software=9.8.4.25
Cisco Adaptive Security Appliance Software=9.8.4.26
Cisco Adaptive Security Appliance Software=9.8.4.29
Cisco Adaptive Security Appliance Software=9.8.4.32
Cisco Adaptive Security Appliance Software=9.8.4.33
Cisco Adaptive Security Appliance Software=9.8.4.34
Cisco Adaptive Security Appliance Software=9.8.4.35
Cisco Adaptive Security Appliance Software=9.8.4.39
Cisco Adaptive Security Appliance Software=9.8.4.40
Cisco Adaptive Security Appliance Software=9.8.4.41
Cisco Adaptive Security Appliance Software=9.8.4.43
Cisco Adaptive Security Appliance Software=9.8.4.44
Cisco Adaptive Security Appliance Software=9.8.4.45
Cisco Adaptive Security Appliance Software=9.8.4.46
Cisco Adaptive Security Appliance Software=9.8.4.48
Cisco Adaptive Security Appliance Software=9.12.1
Cisco Adaptive Security Appliance Software=9.12.1.2
Cisco Adaptive Security Appliance Software=9.12.1.3
Cisco Adaptive Security Appliance Software=9.12.2
Cisco Adaptive Security Appliance Software=9.12.2.1
Cisco Adaptive Security Appliance Software=9.12.2.4
Cisco Adaptive Security Appliance Software=9.12.2.5
Cisco Adaptive Security Appliance Software=9.12.2.9
Cisco Adaptive Security Appliance Software=9.12.3
Cisco Adaptive Security Appliance Software=9.12.3.2
Cisco Adaptive Security Appliance Software=9.12.3.7
Cisco Adaptive Security Appliance Software=9.12.3.9
Cisco Adaptive Security Appliance Software=9.12.3.12
Cisco Adaptive Security Appliance Software=9.12.4
Cisco Adaptive Security Appliance Software=9.12.4.2
Cisco Adaptive Security Appliance Software=9.12.4.4
Cisco Adaptive Security Appliance Software=9.12.4.7
Cisco Adaptive Security Appliance Software=9.12.4.8
Cisco Adaptive Security Appliance Software=9.12.4.10
Cisco Adaptive Security Appliance Software=9.12.4.13
Cisco Adaptive Security Appliance Software=9.12.4.18
Cisco Adaptive Security Appliance Software=9.12.4.24
Cisco Adaptive Security Appliance Software=9.12.4.26
Cisco Adaptive Security Appliance Software=9.12.4.29
Cisco Adaptive Security Appliance Software=9.12.4.30
Cisco Adaptive Security Appliance Software=9.12.4.35
Cisco Adaptive Security Appliance Software=9.12.4.37
Cisco Adaptive Security Appliance Software=9.12.4.38
Cisco Adaptive Security Appliance Software=9.12.4.39
Cisco Adaptive Security Appliance Software=9.12.4.40
Cisco Adaptive Security Appliance Software=9.12.4.41
Cisco Adaptive Security Appliance Software=9.12.4.47
Cisco Adaptive Security Appliance Software=9.12.4.48
Cisco Adaptive Security Appliance Software=9.12.4.50
Cisco Adaptive Security Appliance Software=9.12.4.52
Cisco Adaptive Security Appliance Software=9.12.4.54
Cisco Adaptive Security Appliance Software=9.12.4.55
Cisco Adaptive Security Appliance Software=9.12.4.56
Cisco Adaptive Security Appliance Software=9.12.4.58
Cisco Adaptive Security Appliance Software=9.12.4.62
Cisco Adaptive Security Appliance Software=9.12.4.65
Cisco Adaptive Security Appliance Software=9.12.4.67
Cisco Adaptive Security Appliance Software=9.14.1
Cisco Adaptive Security Appliance Software=9.14.1.6
Cisco Adaptive Security Appliance Software=9.14.1.10
Cisco Adaptive Security Appliance Software=9.14.1.15
Cisco Adaptive Security Appliance Software=9.14.1.19
Cisco Adaptive Security Appliance Software=9.14.1.30
Cisco Adaptive Security Appliance Software=9.14.2
Cisco Adaptive Security Appliance Software=9.14.2.4
Cisco Adaptive Security Appliance Software=9.14.2.8
Cisco Adaptive Security Appliance Software=9.14.2.13
Cisco Adaptive Security Appliance Software=9.14.2.15
Cisco Adaptive Security Appliance Software=9.14.3
Cisco Adaptive Security Appliance Software=9.14.3.1
Cisco Adaptive Security Appliance Software=9.14.3.9
Cisco Adaptive Security Appliance Software=9.14.3.11
Cisco Adaptive Security Appliance Software=9.14.3.13
Cisco Adaptive Security Appliance Software=9.14.3.15
Cisco Adaptive Security Appliance Software=9.14.3.18
Cisco Adaptive Security Appliance Software=9.14.4
Cisco Adaptive Security Appliance Software=9.14.4.6
Cisco Adaptive Security Appliance Software=9.14.4.7
Cisco Adaptive Security Appliance Software=9.14.4.12
Cisco Adaptive Security Appliance Software=9.14.4.13
Cisco Adaptive Security Appliance Software=9.14.4.14
Cisco Adaptive Security Appliance Software=9.14.4.15
Cisco Adaptive Security Appliance Software=9.14.4.17
Cisco Adaptive Security Appliance Software=9.14.4.22
Cisco Adaptive Security Appliance Software=9.14.4.23
Cisco Adaptive Security Appliance Software=9.14.4.24
Cisco Adaptive Security Appliance Software=9.15.1
Cisco Adaptive Security Appliance Software=9.15.1.1
Cisco Adaptive Security Appliance Software=9.15.1.7
Cisco Adaptive Security Appliance Software=9.15.1.10
Cisco Adaptive Security Appliance Software=9.15.1.15
Cisco Adaptive Security Appliance Software=9.15.1.16
Cisco Adaptive Security Appliance Software=9.15.1.17
Cisco Adaptive Security Appliance Software=9.15.1.21
Cisco Adaptive Security Appliance Software=9.16.1
Cisco Adaptive Security Appliance Software=9.16.1.28
Cisco Adaptive Security Appliance Software=9.16.2
Cisco Adaptive Security Appliance Software=9.16.2.3
Cisco Adaptive Security Appliance Software=9.16.2.7
Cisco Adaptive Security Appliance Software=9.16.2.11
Cisco Adaptive Security Appliance Software=9.16.2.13
Cisco Adaptive Security Appliance Software=9.16.2.14
Cisco Adaptive Security Appliance Software=9.16.3
Cisco Adaptive Security Appliance Software=9.16.3.3
Cisco Adaptive Security Appliance Software=9.16.3.14
Cisco Adaptive Security Appliance Software=9.16.3.15
Cisco Adaptive Security Appliance Software=9.16.3.19
Cisco Adaptive Security Appliance Software=9.16.3.23
Cisco Adaptive Security Appliance Software=9.16.4
Cisco Adaptive Security Appliance Software=9.16.4.9
Cisco Adaptive Security Appliance Software=9.16.4.14
Cisco Adaptive Security Appliance Software=9.16.4.18
Cisco Adaptive Security Appliance Software=9.16.4.19
Cisco Adaptive Security Appliance Software=9.16.4.27
Cisco Adaptive Security Appliance Software=9.16.4.38
Cisco Adaptive Security Appliance Software=9.16.4.39
Cisco Adaptive Security Appliance Software=9.16.4.42
Cisco Adaptive Security Appliance Software=9.16.4.48
Cisco Adaptive Security Appliance Software=9.16.4.55
Cisco Adaptive Security Appliance Software=9.16.4.57
Cisco Adaptive Security Appliance Software=9.16.4.61
Cisco Adaptive Security Appliance Software=9.16.4.62
Cisco Adaptive Security Appliance Software=9.17.1
Cisco Adaptive Security Appliance Software=9.17.1.7
Cisco Adaptive Security Appliance Software=9.17.1.9
Cisco Adaptive Security Appliance Software=9.17.1.10
Cisco Adaptive Security Appliance Software=9.17.1.11
Cisco Adaptive Security Appliance Software=9.17.1.13
Cisco Adaptive Security Appliance Software=9.17.1.15
Cisco Adaptive Security Appliance Software=9.17.1.20
Cisco Adaptive Security Appliance Software=9.17.1.30
Cisco Adaptive Security Appliance Software=9.17.1.33
Cisco Adaptive Security Appliance Software=9.17.1.39
Cisco Adaptive Security Appliance Software=9.18.1
Cisco Adaptive Security Appliance Software=9.18.1.3
Cisco Adaptive Security Appliance Software=9.18.2
Cisco Adaptive Security Appliance Software=9.18.2.5
Cisco Adaptive Security Appliance Software=9.18.2.7
Cisco Adaptive Security Appliance Software=9.18.2.8
Cisco Adaptive Security Appliance Software=9.18.3
Cisco Adaptive Security Appliance Software=9.18.3.39
Cisco Adaptive Security Appliance Software=9.18.3.46
Cisco Adaptive Security Appliance Software=9.18.3.53
Cisco Adaptive Security Appliance Software=9.18.3.55
Cisco Adaptive Security Appliance Software=9.18.3.56
Cisco Adaptive Security Appliance Software=9.18.4
Cisco Adaptive Security Appliance Software=9.18.4.5
Cisco Adaptive Security Appliance Software=9.18.4.8
Cisco Adaptive Security Appliance Software=9.18.4.22
Cisco Adaptive Security Appliance Software=9.18.4.24
Cisco Adaptive Security Appliance Software=9.18.4.29
Cisco Adaptive Security Appliance Software=9.18.4.34
Cisco Adaptive Security Appliance Software=9.19.1
Cisco Adaptive Security Appliance Software=9.19.1.5
Cisco Adaptive Security Appliance Software=9.19.1.9
Cisco Adaptive Security Appliance Software=9.19.1.12
Cisco Adaptive Security Appliance Software=9.19.1.18
Cisco Adaptive Security Appliance Software=9.19.1.22
Cisco Adaptive Security Appliance Software=9.19.1.24
Cisco Adaptive Security Appliance Software=9.19.1.27
Cisco Adaptive Security Appliance Software=9.19.1.28
Cisco Adaptive Security Appliance Software=9.19.1.31
Cisco Adaptive Security Appliance Software=9.20.1
Cisco Adaptive Security Appliance Software=9.20.1.5
Cisco Adaptive Security Appliance Software=9.20.2
Cisco Adaptive Security Appliance Software=9.20.2.10
Cisco Adaptive Security Appliance Software=9.20.2.21
Cisco Adaptive Security Appliance Software=9.20.2.22

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-20493?

    CVE-2024-20493 is classified as a critical vulnerability due to its potential to deny VPN user authentications.

  • How do I fix CVE-2024-20493?

    To fix CVE-2024-20493, apply the security updates provided by Cisco for the affected Cisco Adaptive Security Appliance and Cisco Firepower Threat Defense software versions.

  • What versions of Cisco products are affected by CVE-2024-20493?

    CVE-2024-20493 affects multiple versions of Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software.

  • Can CVE-2024-20493 be exploited remotely?

    Yes, CVE-2024-20493 can be exploited by unauthenticated remote attackers.

  • What impact does CVE-2024-20493 have on users?

    CVE-2024-20493 may prevent users from authenticating to the VPN service on affected devices.

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