CVE-2026-20007
published 2026-03-04CVE-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…
PriorityP336medium5.8CVSS 3.1
AVNACLPRNUINSCCNILAN
EPSS
0.25%
16.1th percentile
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.
Affected
74 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
CVSS provenance
nvdv3.15.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
vendor_cisco5.8MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-33pq-q8j2-pf3g: A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticate
ghsa_unreviewed·2026-03-04
CVE-2026-20007 [MEDIUM] CWE-284 GHSA-33pq-q8j2-pf3g: A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticate
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
Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
vendor_cisco·2026-03-04·CVSS 5.8
CVE-2026-20007 [MEDIUM] CWE-284 Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
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 tr
Cisco
Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
vendor_cisco·CVSS 3.1
CVE-2026-20007 Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
CVE-2026-20007: Cisco Secure Firewall Threat Defense Software Snort Deep Inspection Bypass Vulnerability
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 attac
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-03-04
Published