high
7.8
CWE
401 770
Advisory Published
Updated

CVE-2021-40114: Multiple Cisco Products Snort Memory Leak Denial of Service Vulnerability

First published: Wed Oct 27 2021(Updated: )

Multiple Cisco products are affected by a vulnerability in the way the Snort detection engine processes ICMP traffic that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper memory resource management while the Snort detection engine is processing ICMP packets. An attacker could exploit this vulnerability by sending a series of ICMP packets through an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device, causing the device to reload.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
debian/snort<=2.9.7.0-5<=2.9.15.1-5<=2.9.15.1-6
2.9.20-0+deb10u1
2.9.20-0+deb11u1
Cisco Firepower Management Center=2.9.14.0
Cisco Firepower Management Center=2.9.15
Cisco Firepower Management Center=2.9.16
Cisco Firepower Management Center=2.9.17
Cisco Firepower Threat Defense<6.4.0.12
Cisco Firepower Threat Defense>=6.5.0<6.6.3
Cisco Firepower Threat Defense>=6.7.0<6.7.0.2
Cisco Unified Threat Defense>=16.12<16.12.6
Cisco Unified Threat Defense>=17.3<17.3.4a
Cisco Unified Threat Defense>=17.4<17.4.2
Snort Snort>=2.0.0<2.9.18
Cisco Secure Firewall Management Center=2.9.14.0
Cisco Secure Firewall Management Center=2.9.15
Cisco Secure Firewall Management Center=2.9.16
Cisco Secure Firewall Management Center=2.9.17

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-40114?

    CVE-2021-40114 is a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  • Which Cisco products are affected by CVE-2021-40114?

    Multiple Cisco products, including Firepower Management Center and Firepower Threat Defense, are affected by CVE-2021-40114.

  • How severe is CVE-2021-40114?

    CVE-2021-40114 has a severity rating of 7.5 (high).

  • How can I fix CVE-2021-40114?

    To fix CVE-2021-40114, it is recommended to update the affected software to the latest version provided by the vendor.

  • Where can I find more information about CVE-2021-40114?

    You can find more information about CVE-2021-40114 in the references provided: [link1](https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html), [link2](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-s2R7W9UU), [link3](https://www.debian.org/security/2023/dsa-5354).

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