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CVE-2026-20007

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 attacke…

Published Mar 4, 2026 · updated Aug 20, 2026 · cisco secure firewall threat defense

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.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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 al

  2. Aug 20, 2026 · NIST NVD

    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 al

Affected

  • cpe cisco/secure firewall threat defense6.4.0
  • cpe cisco/secure firewall threat defense6.4.0.1
  • cpe cisco/secure firewall threat defense6.4.0.2
  • cpe cisco/secure firewall threat defense6.4.0.3
  • cpe cisco/secure firewall threat defense6.4.0.4
  • cpe cisco/secure firewall threat defense6.4.0.5
  • cpe cisco/secure firewall threat defense6.4.0.6
  • cpe cisco/secure firewall threat defense6.4.0.7

Sources

  • CVE.orgVulnerability recordCVE-2026-20007

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-20007

    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 vuln

    nvd.nist.gov

References