SB2026030321 - Multiple vulnerabilities in WatchGuard Firebox Fireware OS

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Main Vulnerability Database SB2026030321

SB2026030321 - Multiple vulnerabilities in WatchGuard Firebox Fireware OS

Published: March 3, 2026

Security Bulletin ID SB2026030321
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2026-3342)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists due to a boundary error when processing untrusted input. A remote authenticated administrator can send specially crafted requests via management interface to trigger an out-of-bounds write and execute arbitrary code with root privileges. 


2) Improper validation of integrity check value (CVE-ID: CVE-2026-3344)

CWE-ID: CWE-354 - Improper Validation of Integrity Check Value

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to improper validation of integrity checks. A remote privileged user can maintain limited persistence via a maliciously-crafted firmware update package.


3) Cross-site scripting (CVE-ID: CVE-2026-3343)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


Remediation

Install update from vendor's website.

References