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Multiple Cisco Products Snort 3 Visual Basic for Applications Denial of Service Vulnerabilities

cisco-sa-ftd-snort3-vbavuls-96UcVVed · Medium · Published · Updated

Multiple Cisco products are affected by vulnerabilities in the Snort 3 Visual Basic for Applications (VBA) Decompression Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities. There are workarounds that address these vulnerabilities. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed 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 is a workaround that addresses these vulnerabilities.

The vulnerabilities described in this advisory are due to VBA decompression, which is not enabled by default for any Snort 3 Inspector. If VBA decompression is disabled until the device can be upgraded to a fixed software release, the device will not be affected by these vulnerabilities. For further details on how to remove the VBA configuration, see the following references:

Firewall Management Center Features in Version 7.2.0 ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/release-notes/threat-defense/720/threat-defense-release-notes-72.html#Cisco_Concept.dita_c09a8957-13ac-4b4e-bcae-a141acadd92d"]
Snort 3 Inspector Reference ["https://www.cisco.com/go/snort3-inspectors"]
Cisco Secure Firewall Management Center Snort 3 Configuration Guide, Version 7.2 ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/management-center/snort/720/snort3-configuration-guide-v72.html"]

While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2026-20053, CVE-2026-20054, CVE-2026-20057, CVE-2026-20058
Cisco Bug IDsCSCwq23373, CSCwq97494, CSCwq97497, CSCwq23372, CSCwq97750, CSCwq97748, CSCwq97660, CSCwq97658, CSCwq23377, CSCwq23369, CSCwr21406
CVSS ScoreBase 5.8
Base 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X
Product Names From Source
Cisco Cyber Vision, Cisco UTD SNORT IPS Engine Software, 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 7.4.2.3, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.4, Cisco Secure Firewall Threat Defense (FTD) Software 7.4.3, 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 7.7.10, Cisco Secure Firewall Threat Defense (FTD) Software 7.7.10.1, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, 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

Related Products

Product CVE Evidence
Cisco UTD SNORT IPS Engine Software CVE-2026-20058 Cisco OpenVuln
Cisco UTD SNORT IPS Engine Software CVE-2026-20057 Cisco OpenVuln
Cisco UTD SNORT IPS Engine Software CVE-2026-20054 Cisco OpenVuln
Cisco UTD SNORT IPS Engine Software CVE-2026-20053 Cisco OpenVuln
Cisco Secure Firewall Threat Defense Virtual CVE-2026-20058 Cisco OpenVuln
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Cisco Secure Firewall Threat Defense Virtual CVE-2026-20054 Cisco OpenVuln
Cisco Secure Firewall Threat Defense Virtual CVE-2026-20053 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2026-20058 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2026-20057 Cisco OpenVuln
Cisco Secure Firewall Threat Defense (FTD) Software CVE-2026-20054 Cisco OpenVuln
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Cisco Secure Firewall 3100 Series CVE-2026-20058 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2026-20057 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2026-20054 Cisco OpenVuln
Cisco Secure Firewall 3100 Series CVE-2026-20053 Cisco OpenVuln
Cisco Secure Firewall 1200 Series CVE-2026-20058 Cisco OpenVuln
Cisco Secure Firewall 1200 Series CVE-2026-20057 Cisco OpenVuln
Cisco Secure Firewall 1200 Series CVE-2026-20054 Cisco OpenVuln
Cisco Secure Firewall 1200 Series CVE-2026-20053 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2026-20058 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2026-20057 Cisco OpenVuln
Cisco Firepower 9000 Series CVE-2026-20054 Cisco OpenVuln
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Cisco Firepower 4100 Series CVE-2026-20058 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2026-20057 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2026-20054 Cisco OpenVuln
Cisco Firepower 4100 Series CVE-2026-20053 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20058 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20057 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20054 Cisco OpenVuln
Cisco Firepower 2100 Series CVE-2026-20053 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2026-20058 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2026-20057 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2026-20054 Cisco OpenVuln
Cisco Firepower 1000 Series CVE-2026-20053 Cisco OpenVuln
Cisco Cyber Vision CVE-2026-20058 Cisco OpenVuln
Cisco Cyber Vision CVE-2026-20057 Cisco OpenVuln
Cisco Cyber Vision CVE-2026-20054 Cisco OpenVuln
Cisco Cyber Vision CVE-2026-20053 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20058 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20057 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20054 Cisco OpenVuln
Cisco 3000 Series Industrial Security Appliances (ISA) CVE-2026-20053 Cisco OpenVuln