CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-20006

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.004

EPSS Ranking 31.2%

CVSS Severity

CVSS v3 Score 5.8

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-rHfqnwRg

Products affected by CVE-2026-20006

Cisco » Secure Firewall Threat Defense » Version: 7.2.0

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0
Cisco » Secure Firewall Threat Defense » Version: 7.2.0.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1
Cisco » Secure Firewall Threat Defense » Version: 7.2.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1
Cisco » Secure Firewall Threat Defense » Version: 7.2.10

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10
Cisco » Secure Firewall Threat Defense » Version: 7.2.10.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.10.2
Cisco » Secure Firewall Threat Defense » Version: 7.2.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2
Cisco » Secure Firewall Threat Defense » Version: 7.2.3

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3
Cisco » Secure Firewall Threat Defense » Version: 7.2.4

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4
Cisco » Secure Firewall Threat Defense » Version: 7.2.4.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.4.1
Cisco » Secure Firewall Threat Defense » Version: 7.2.5

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5
Cisco » Secure Firewall Threat Defense » Version: 7.2.5.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.1
Cisco » Secure Firewall Threat Defense » Version: 7.2.5.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.5.2
Cisco » Secure Firewall Threat Defense » Version: 7.2.6

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.6
Cisco » Secure Firewall Threat Defense » Version: 7.2.7

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.7
Cisco » Secure Firewall Threat Defense » Version: 7.2.8

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8
Cisco » Secure Firewall Threat Defense » Version: 7.2.8.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.8.1
Cisco » Secure Firewall Threat Defense » Version: 7.2.9

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.9
Cisco » Secure Firewall Threat Defense » Version: 7.3.0

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0
Cisco » Secure Firewall Threat Defense » Version: 7.3.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1
Cisco » Secure Firewall Threat Defense » Version: 7.3.1.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1
Cisco » Secure Firewall Threat Defense » Version: 7.3.1.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.2
Cisco » Secure Firewall Threat Defense » Version: 7.4.0

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.0
Cisco » Secure Firewall Threat Defense » Version: 7.4.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1
Cisco » Secure Firewall Threat Defense » Version: 7.4.1.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.1.1
Cisco » Secure Firewall Threat Defense » Version: 7.4.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2
Cisco » Secure Firewall Threat Defense » Version: 7.4.2.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.1
Cisco » Secure Firewall Threat Defense » Version: 7.4.2.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.2
Cisco » Secure Firewall Threat Defense » Version: 7.4.2.3

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.3
Cisco » Secure Firewall Threat Defense » Version: 7.4.2.4

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.4.2.4
Cisco » Secure Firewall Threat Defense » Version: 7.6.0

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0
Cisco » Secure Firewall Threat Defense » Version: 7.6.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.1
Cisco » Secure Firewall Threat Defense » Version: 7.6.2

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2
Cisco » Secure Firewall Threat Defense » Version: 7.6.2.1

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.2.1

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-20006

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