What’s Vulnerable › Vulnerabilities
CVE-2026-20052: Cisco Secure Firewall Threat Defense Software Snort 3 Memory Management Denial of Service Vulnerability
- Severity: medium (CVSS 5.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-08-20
- Weakness: CWE-788
Description
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.
Affected products
- Cisco Firepower Threat Defense Software: 7.4.0, 7.4.1, 7.4.1.1, 7.4.2, 7.4.2.1, 7.6.0
References
Get alerted when CVE-2026-20052 or the next vulnerability affects your stack