WatchGuard Fireware OS up to 11.12.4+541730/12.5.16/12.11.7/2026.1.1 out-of-bounds write

Summaryinfo

A vulnerability, which was classified as critical, has been found in WatchGuard Fireware OS up to 11.12.4+541730/12.5.16/12.11.7/2026.1.1. Affected is an unknown function. The manipulation leads to out-of-bounds write. This vulnerability is referenced as CVE-2026-3342. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in WatchGuard Fireware OS up to 11.12.4+541730/12.5.16/12.11.7/2026.1.1. This issue affects an unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an authenticated privileged administrator to execute arbitrary code with root permissions via an exposed management interface. This vulnerability affects Fireware OS 11.9 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.

The weakness was published by btaol as wgsa-2026-0003. The advisory is shared at watchguard.com. The identification of this vulnerability is CVE-2026-3342 since 02/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/06/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• WatchGuard

Name

• Fireware OS

Version

• 11.12.4+541730
• 12.5.0
• 12.5.1
• 12.5.2
• 12.5.3
• 12.5.4
• 12.5.5
• 12.5.6
• 12.5.7
• 12.5.8
• 12.5.9
• 12.5.10
• 12.5.11
• 12.5.12
• 12.5.13
• 12.5.14
• 12.5.15
• 12.5.16
• 12.11.0
• 12.11.1
• 12.11.2
• 12.11.3
• 12.11.4
• 12.11.5
• 12.11.6
• 12.11.7
• 2026.1.0
• 2026.1.1

License

• commercial

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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