SB2026030449 - Multiple vulnerabilities in Cisco Firewall Threat Defense (FTD)

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Main Vulnerability Database SB2026030449

SB2026030449 - Multiple vulnerabilities in Cisco Firewall Threat Defense (FTD)

Published: March 4, 2026

Security Bulletin ID SB2026030449
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-20053)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 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


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.


2) Infinite loop (CVE-ID: CVE-2026-20054)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 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


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

The vulnerability exists due to infinite loop in the Snort 3 VBA feature. A remote attacker can send specially crafted VBA data to the Snort 3 Detection Engine and perform a denial of service attack.


3) Improper error handling (CVE-ID: CVE-2026-20057)

CWE-ID: CWE-388 - Error Handling

CVSSv4: 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


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

The vulnerability exists due to improper error handling in the Snort 3 VBA feature. A remote attacker can send specially crafted VBA data to the Snort 3 Detection Engine and perform a denial of service attack.


4) Improper error handling (CVE-ID: CVE-2026-20058)

CWE-ID: CWE-388 - Error Handling

CVSSv4: 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


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

The vulnerability exists due to improper error handling in the Snort 3 VBA feature. A remote attacker can send specially crafted VBA data to the Snort 3 Detection Engine and perform a denial of service attack.


Remediation

Install update from vendor's website.

References