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.

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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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