Memory Management Vulnerability in Cisco Secure Firewall Snort 3 Detection Engine
CVE-2026-20052

5.8MEDIUM

Key Information:

Vendor

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

Badges

👾 Exploit Exists

What is CVE-2026-20052?

A logic error in the memory management during SSL packet inspection within the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense Software enables unauthenticated, remote attackers to exploit the system. By sending crafted SSL packets through an active connection, attackers may trigger a restart of the Snort 3 Detection Engine, leading to a denial of service (DoS) condition.

Affected Version(s)

Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0

Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1

Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1

References

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

CVSS V3.1

Score:
5.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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