SB2026030321 - Multiple vulnerabilities in WatchGuard Firebox Fireware OS
Published: March 3, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2026-3342)
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)
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)
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.