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Vulnerabilities

Vulnerability · 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 unauthenticate…

Published Mar 4, 2026 · catalog updated Aug 20, 2026 · secure firewall threat defense

Check if you run it

No confirmed exploitation is on record for CVE-2026-20052. EPSS is 0.43%. Act only if a listed version of secure firewall threat defense is installed.

Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe cisco/secure firewall threat defense

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/secure firewall threat defense7.4.0
  • cpe cisco/secure firewall threat defense7.4.1
  • cpe cisco/secure firewall threat defense7.4.1.1
  • cpe cisco/secure firewall threat defense7.4.2
  • cpe cisco/secure firewall threat defense7.4.2.1
  • cpe cisco/secure firewall threat defense7.6.0

How to fix CVE-2026-20052

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20052. EPSS is 0.43%. Act only if a listed version of secure firewall threat defense is installed.

Which versions are affected?

Compare what you have installed with cisco/secure firewall threat defense 7.4.0; cisco/secure firewall threat defense 7.4.1; cisco/secure firewall threat defense 7.4.1.1; cisco/secure firewall threat defense 7.4.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-788. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 4, 2026 · NIST NVD

    Detected

    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 vulnerabil

  2. Aug 20, 2026 · NIST NVD

    Updated

    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 vulnerabil

Sources

  • CVE.orgVulnerability recordCVE-2026-20052

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20052

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-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 erro

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.