There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2021-40114)

According to its self-reported version, Cisco FTD Software is affected by a denial of service vulnerability. A denial of service (DoS) vulnerability exists in the way the Snort detection engine processes ICMP traffic. An unauthenticated, remote attacker can exploit this issue by sending a series of ICMP packets which can cause the device to stop responding.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5354 advisory.

    Multiple security vulnerabilities were discovered in snort, a flexible Network Intrusion Detection System,     which could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or     bypass filtering technology on an affected device and ex-filtrate data from a compromised host. For the     stable distribution (bullseye), these problems have been fixed in version 2.9.20-0+deb11u1. We recommend     that you upgrade your snort packages. For the detailed security status of snort please refer to its     security tracker page at: https://security-tracker.debian.org/tracker/snort

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3317 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3317-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     February 11, 2023                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : snort     Version        : 2.9.20-0+deb10u1     CVE ID         : CVE-2020-3299 CVE-2020-3315 CVE-2021-1223 CVE-2021-1224                      CVE-2021-1236 CVE-2021-1494 CVE-2021-1495 CVE-2021-34749                      CVE-2021-40114     Debian Bug     : 1021276

    Multiple security vulnerabilities were discovered in snort, a flexible Network     Intrusion Detection System, which could allow an unauthenticated, remote     attacker to cause a denial of service (DoS) condition or bypass filtering     technology on an affected device and ex-filtrate data from a compromised host.

    For Debian 10 buster, these problems have been fixed in version     2.9.20-0+deb10u1.

    We recommend that you upgrade your snort packages.

    For the detailed security status of snort please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/snort

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-40114)

Note that Nessus relies on the presence of the package as reported by the vendor.

According to its self-reported version, Cisco UTD Software is affected by a denial of service vulnerability. A denial of service (DoS) vulnerability exists in the way the Snort detection engine processes ICMP traffic. An unauthenticated, remote attacker can exploit this issue by sending a series of ICMP packets which can cause the device to stop responding.

Please see the included Cisco BIDs and Cisco Security Advisory for more information

ID	Name	Product	Family	Published	Updated	Severity
424498	Alpine: multiple snort packages: security update to 2.9.18-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	high
424498	Alpine: multiple snort packages: security update to 2.9.18-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	high
161866	Cisco Firepower Threat Defense Snort Memory Leak DoS (cisco-sa-snort-dos-s2R7W9UU)	Nessus	CISCO	6/6/2022	6/7/2022	high
171628	Debian DSA-5354-1 : snort - security update	Nessus	Debian Local Security Checks	2/18/2023	1/24/2025	high
171378	Debian dla-3317 : snort - security update	Nessus	Debian Local Security Checks	2/11/2023	1/22/2025	high
262843	Linux Distros Unpatched Vulnerability : CVE-2021-40114	Nessus	Misc.	9/10/2025	7/12/2026	high
161865	Cisco IOS XE Software Unified Threat Defense DoS (cisco-sa-snort-dos-s2R7W9UU)	Nessus	CISCO	6/6/2022	5/3/2024	high

Detections

Analytics

Plugins Search

high

high

high

high

high

high

high