Denial of Service Vulnerability in Cisco Secure Firewall Threat Defense Software
CVE-2026-20050

6.8MEDIUM

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
4 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20050?

A vulnerability in the Do Not Decrypt exclusion feature of Cisco Secure Firewall Threat Defense Software can be exploited by an unauthenticated remote attacker. This security flaw arises from improper memory management during the inspection of TLS 1.2 encrypted traffic. By sending specifically crafted TLS 1.2 packets, an attacker can trigger a denial of service condition, leading to a reload of the affected device. Notably, this vulnerability solely impacts devices handling TLS 1.2 encrypted traffic, leaving other TLS versions unaffected.

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Deploy the Patch

Affected Version(s)

Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0

Cisco Secure Firewall Threat Defense (FTD) Software 7.0.0.1

Cisco Secure Firewall Threat Defense (FTD) Software 7.0.1

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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