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Vulnerable Software

Vulnerability Details CVE-2026-20052

A vulnerability in the memory management handling for 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 restart. This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.004

EPSS Ranking 33.0%

CVSS Severity

CVSS v3 Score 5.8

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3ssl-FBEKYXpH

Products affected by CVE-2026-20052

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: 7.6.0

cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-20052

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