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Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability

cisco-sa-ftd-snort-bypass-rLggKzVF · Medium · Published · Updated

A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Snort rules and allow traffic onto the network that should have been dropped. This vulnerability is due to a logic error in the integration of the Snort Engine rules with Cisco Secure FTD Software that could allow different Snort rules to be hit when deep inspection of the packet is performed for the inner and outer connections. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device that would hit configured Snort rules. A successful exploit could allow the attacker to send traffic to a network where it should have been denied. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort-bypass-rLggKzVF This advisory is part of the March 2026 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2026 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication.

Cisco advisory ·CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2026-20007
Cisco Bug IDsCSCwo54753, CSCwp34291
CVSS ScoreBase 5.8
Base 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.5, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.6.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.7, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8, Cisco Secure Firewall Threat Defense (FTD) Software 7.0.8.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.1.0.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.6, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.7, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.9, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10, Cisco Secure Firewall Threat Defense (FTD) Software 7.2.10.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.0, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.2, Cisco Secure Firewall Threat Defense (FTD) Software 7.6.2.1, Cisco Secure Firewall Threat Defense (FTD) Software 7.7.0, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, Cisco Secure Firewall Threat Defense Virtual, Cisco Secure Firewall 3100 Series, Cisco Secure Firewall 4200 Series, Cisco Secure Firewall 1200 Series

CSAF Product Statuses

Product Status Source CVE Rows
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco 3000 Series Industrial Security Appliances (ISA) known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco ASA 5500-X Series Firewalls known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco Firepower 1000 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco Firepower 2100 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco Firepower 4100 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco Firepower 9000 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0 when installed on Cisco Secure Firewall Threat Defense Virtual known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 when installed on Cisco 3000 Series Industrial Security Appliances (ISA) known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 when installed on Cisco ASA 5500-X Series Firewalls known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 when installed on Cisco Firepower 1000 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 when installed on Cisco Firepower 2100 Series known_affected cisco_csaf CVE-2026-20007 1
Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1 when installed on Cisco Firepower 4100 Series known_affected cisco_csaf CVE-2026-20007 1

Showing 12 of 361 CSAF status groups; 349 more not shown.

Related Products

Product CVE Evidence
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software CVE-2026-20007 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2026-20007 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Firepower 1000 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco ASA 5500-X Series Firewalls CVE-2026-20007 Cisco OpenVuln · family-level
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Firepower 9000 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Firepower 4100 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Secure Firewall 3100 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Secure Firewall 4200 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Secure Firewall 1200 Series CVE-2026-20007 Cisco OpenVuln · family-level
Cisco Secure Firewall Threat Defense Virtual CVE-2026-20007 Cisco OpenVuln
Cisco Adaptive Security Appliance (ASA) Software CVE-2026-20007 Cisco OpenVuln
Cisco Firepower Threat Defense Software CVE-2026-20007 Cisco OpenVuln
Cisco 3000 Series Routers CVE-2026-20007 Cisco OpenVuln