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 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.

According to its self-reported version, Cisco IOS XE is affected by a vulnerability in the Snort   detection engine due to a flaw in the handling of HTTP header parameters. An unauthenticated, remote attacker can   exploit this by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker   to bypass a configured file policy for HTTP packets and deliver a malicious payload.

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

According to its self-reported version, Cisco IOS XE is affected by a vulnerability in the Snort   detection engine due to a flaw in the handling of HTTP header parameters. An unauthenticated, remote attacker can exploit this by   sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file   policy for HTTP packets and deliver a malicious payload.

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

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 Snort detection engine that could allow an     unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to     incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by     sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to     bypass a configured file policy for HTTP packets and deliver a malicious payload. (CVE-2021-1495)

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

ID	Name	Product	Family	Published	Updated	Severity
171378	Debian dla-3317 : snort - security update	Nessus	Debian Local Security Checks	2/11/2023	1/22/2025	high
171628	Debian DSA-5354-1 : snort - security update	Nessus	Debian Local Security Checks	2/18/2023	1/24/2025	high
150058	Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass (cisco-sa-http-fp-bp-KfDdcQhc)	Nessus	CISCO	5/28/2021	11/18/2024	medium
150059	Cisco Firepower Threat Defence Snort HTTP Detection Engine File Policy Bypass (cisco-sa-http-fp-bp-KfDdcQhc)	Nessus	CISCO	5/28/2021	11/18/2024	medium
262780	Linux Distros Unpatched Vulnerability : CVE-2021-1495	Nessus	Misc.	9/10/2025	9/10/2025	medium

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