CVE-2026-20050 json
Cisco Secure Firewall Threat Defense Decryption Policy Denial of Service Vulnerability
published 2026-03-04 8 mo ago modified 2026-08-11 2 mo ago also EUVD-2026-9457
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
A vulnerability in the Do Not Decrypt exclusion feature of the SSL decryption feature of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper memory management during the inspection of TLS 1.2 encrypted traffic. An attacker could exploit this vulnerability by sending crafted TLS 1.2 encrypted traffic through an affected device. A successful exploit could allow the attacker to cause a reload of an affected device. Note: This vulnerability only affects traffic that is encrypted by TLS 1.2. Other versions of TLS are not affected.
Patch / fix
- cisco secure_firewall_threat_defense 7.2.11, 7.4.4, 7.6.4, 7.7.11
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
Affected products
- Cisco Cisco Secure Firewall Threat Defense (FTD) Software
Classification
- Weakness
-
- CWE-404 Improper Resource Shutdown or Release
References
Sources
- CVE List CVE-2026-20050
- NVD CVE-2026-20050
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