8.6
CWE
20 119
Advisory Published
Updated

CVE-2021-1402: Cisco Firepower Threat Defense Software SSL Decryption Policy Denial of Service Vulnerability

First published: Thu Apr 29 2021(Updated: )

A vulnerability in the software-based SSL/TLS message handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message through an affected device. SSL/TLS messages sent to an affected device do not trigger this vulnerability. A successful exploit could allow the attacker to cause a process to crash. This crash would then trigger a reload of the device. No manual intervention is needed to recover the device after the reload.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Firepower Threat Defense>=6.3.0<6.4.0
Cisco Firepower Threat Defense>=6.5.0<6.6.0
Cisco Firepower Threat Defense Virtual
Cisco Asa 5512-x
Cisco Asa 5515-x
Cisco Asa 5525-x
Cisco Asa 5545-x
Cisco Asa 5555-x
Cisco Firepower 1010
Cisco Firepower 1120
Cisco Firepower 1140
Cisco Firepower 1150
Cisco Firepower 2110
Cisco Firepower 2120
Cisco Firepower 2130
Cisco Firepower 2140
Cisco Isa 3000

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Frequently Asked Questions

  • What is CVE-2021-1402?

    CVE-2021-1402 is a vulnerability in the software-based SSL/TLS message handler of Cisco Firepower Threat Defense (FTD) Software.

  • How does CVE-2021-1402 affect Cisco Firepower Threat Defense?

    CVE-2021-1402 allows an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition.

  • What is the severity of CVE-2021-1402?

    CVE-2021-1402 has a severity rating of 8.6, which is considered high.

  • How can I fix CVE-2021-1402?

    To fix CVE-2021-1402, update to a version of Cisco Firepower Threat Defense (FTD) Software that is not affected by the vulnerability.

  • Where can I find more information about CVE-2021-1402?

    You can find more information about CVE-2021-1402 on the Cisco Security Advisory page at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-ssl-decrypt-dos-DdyLuK6c.

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