Heap-based buffer overflow in Cisco Firewall Threat Defense (FTD) - CVE-2026-20053

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Main Vulnerability Database Vulnerabilities #VU123535

Heap-based buffer overflow in Cisco Firewall Threat Defense (FTD) - CVE-2026-20053

Published: March 4, 2026


Vulnerability identifier: #VU123535
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20053
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Firewall Threat Defense (FTD)

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a boundary error in the Snort 3 VBA feature. A remote attacker can send  specially crafted VBA data to the Snort 3 Detection Engine, trigger a heap-based buffer overflow and perform a denial of service attack.


How to mitigate CVE-2026-20053

Install updates from vendor's website.

Sources