Vulnerability in Cisco Secure Firewall Threat Defense (Ftd) Software
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (33.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.4.0, 7.4.1, 7.4.1.1
- Cisco Secure Firewall Threat Defense — versions 7.4.0, 7.4.1, 7.4.1.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20052?
- CVE-2026-20052 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense (Ftd) Software, classified under CWE-788. CVSS score: 5.8/10. Published 2026-03-04.
- How severe is CVE-2026-20052?
- Medium severity. CVSS v3 base score is 5.8 out of 10.