Read the docs
TI-2026-16225 Aliases CVE-2026-20006GHSA-mh5f-h37q-2qm8

Cisco Firepower Threat Defense Software and Cisco FirePOWER Services TLS with Snort 3 Denial of Service Vulnerability

Priority LOW 32CWE-388Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition. This vulnerability is due to improper implementation of the TLS protocol. An attacker could exploit this vulnerability by sending a crafted TLS packet to an affected system. A successful exploit could allow the attacker to cause a device that is running Cisco Secure FTD Software to drop network traffic, resulting in a DoS condition.  Note: TLS 1.3 is not affected by this vulnerability.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00433 37th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Secure Firewall Threat Defense (FTD) Software7.2.0; 7.2.0.1; 7.2.1; 7.3.0; 7.2.2; 7.2.3; 7.3.1; 7.2.4; 7.2.5; 7.2.4.1; 7.3.1.1; 7.4.0; 7.2.5.1; 7.4.1; 7.2.6; 7.4.1.1; 7.2.7; 7.2.5.2; 7.3.1.2; 7.2.8; 7.6.0; 7.4.2; 7.2.8.1; 7.4.2.1; 7.2.9; 7.4.2.2; 7.2.10; 7.6.1; 7.4.2.3; 7.6.2; 7.6.2.1; 7.4.2.4; 7.2.10.2—No fix listedCNA
  • Cisco Secure Firewall Threat Defense (FTD) Software VendorCisco Affected 7.2.0; 7.2.0.1; 7.2.1; 7.3.0; 7.2.2; 7.2.3; 7.3.1; 7.2.4; 7.2.5; 7.2.4.1; 7.3.1.1; 7.4.0; 7.2.5.1; 7.4.1; 7.2.6; 7.4.1.1; 7.2.7; 7.2.5.2; 7.3.1.2; 7.2.8; 7.6.0; 7.4.2; 7.2.8.1; 7.4.2.1; 7.2.9; 7.4.2.2; 7.2.10; 7.6.1; 7.4.2.3; 7.6.2; 7.6.2.1; 7.4.2.4; 7.2.10.2 Fixed in — No fix listed CNA

CPE configurations NVD · 33

CPEVersionsRoleVendor
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:*:*:*:*:*:*:*7.2.0VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:*:*:*:*:*:*:*7.2.0.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:*:*:*:*:*:*:*7.2.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:*:*:*:*:*:*:*7.2.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:*:*:*:*:*:*:*7.2.3VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4:*:*:*:*:*:*:*7.2.4VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1:*:*:*:*:*:*:*7.2.4.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5:*:*:*:*:*:*:*7.2.5VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1:*:*:*:*:*:*:*7.2.5.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2:*:*:*:*:*:*:*7.2.5.2VulnerableCisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:*:*:*:*:*:*:* Versions 7.2.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:*:*:*:*:*:*:* Versions 7.2.0.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:*:*:*:*:*:*:* Versions 7.2.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:*:*:*:*:*:*:* Versions 7.2.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:*:*:*:*:*:*:* Versions 7.2.3 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4:*:*:*:*:*:*:* Versions 7.2.4 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1:*:*:*:*:*:*:* Versions 7.2.4.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5:*:*:*:*:*:*:* Versions 7.2.5 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1:*:*:*:*:*:*:* Versions 7.2.5.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2:*:*:*:*:*:*:* Versions 7.2.5.2 Vulnerable ·Cisco
Show 23 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6:*:*:*:*:*:*:*7.2.6VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7:*:*:*:*:*:*:*7.2.7VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8:*:*:*:*:*:*:*7.2.8VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1:*:*:*:*:*:*:*7.2.8.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.9:*:*:*:*:*:*:*7.2.9VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10:*:*:*:*:*:*:*7.2.10VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10.2:*:*:*:*:*:*:*7.2.10.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:*:*:*:*:*:*:*7.3.0VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:*:*:*:*:*:*:*7.3.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:*:*:*:*:*:*:*7.3.1.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2:*:*:*:*:*:*:*7.3.1.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.0:*:*:*:*:*:*:*7.4.0VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1:*:*:*:*:*:*:*7.4.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1:*:*:*:*:*:*:*7.4.1.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2:*:*:*:*:*:*:*7.4.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.1:*:*:*:*:*:*:*7.4.2.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.2:*:*:*:*:*:*:*7.4.2.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.3:*:*:*:*:*:*:*7.4.2.3VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.4:*:*:*:*:*:*:*7.4.2.4VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0:*:*:*:*:*:*:*7.6.0VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.1:*:*:*:*:*:*:*7.6.1VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2:*:*:*:*:*:*:*7.6.2VulnerableCisco
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2.1:*:*:*:*:*:*:*7.6.2.1VulnerableCisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6:*:*:*:*:*:*:* Versions 7.2.6 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7:*:*:*:*:*:*:* Versions 7.2.7 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8:*:*:*:*:*:*:* Versions 7.2.8 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1:*:*:*:*:*:*:* Versions 7.2.8.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.9:*:*:*:*:*:*:* Versions 7.2.9 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10:*:*:*:*:*:*:* Versions 7.2.10 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10.2:*:*:*:*:*:*:* Versions 7.2.10.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:*:*:*:*:*:*:* Versions 7.3.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:*:*:*:*:*:*:* Versions 7.3.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:*:*:*:*:*:*:* Versions 7.3.1.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2:*:*:*:*:*:*:* Versions 7.3.1.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.0:*:*:*:*:*:*:* Versions 7.4.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1:*:*:*:*:*:*:* Versions 7.4.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1:*:*:*:*:*:*:* Versions 7.4.1.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2:*:*:*:*:*:*:* Versions 7.4.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.1:*:*:*:*:*:*:* Versions 7.4.2.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.2:*:*:*:*:*:*:* Versions 7.4.2.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.3:*:*:*:*:*:*:* Versions 7.4.2.3 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.4:*:*:*:*:*:*:* Versions 7.4.2.4 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0:*:*:*:*:*:*:* Versions 7.6.0 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.1:*:*:*:*:*:*:* Versions 7.6.1 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2:*:*:*:*:*:*:* Versions 7.6.2 Vulnerable ·Cisco
  • cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2.1:*:*:*:*:*:*:* Versions 7.6.2.1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20006
  2. 2026-10-03 Alias added: GHSA-mh5f-h37q-2qm8

References

Advisory 1

  • TI-2025-14628 Buffer overflow in Cisco Secure Firewall Adaptive Security Appliance Software KEVCVSS 3.1CRITICAL 9.9
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
  • TI-2023-06973 Authentication bypass in Cisco Adaptive Security Appliance Software KEVCVSS 3.1CRITICAL 9.1
  • TI-2026-82192 Denial of service in Cisco Secure Firewall ASA and FTD SSL VPN KEVCVSS 3.1HIGH 8.6
  • TI-2026-16533 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense… KEVCVSS 3.1HIGH 8.6
  • TI-2025-14657 Missing authorization in Cisco Secure Firewall Adaptive Security Appliance Software KEVCVSS 3.1HIGH 8.6
See all 276 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences