CVE-2026-81851: CWE-122 in WatchGuard Fireware OS
Description
CVE-2026-81851 is a heap-based buffer overflow vulnerability in the iked process of WatchGuard Fireware OS. It allows an authenticated administrator to cause a denial of service by crashing the IKE daemon through saving a specially crafted configuration. The vulnerability requires high privileges and no user interaction. It has a medium severity score of 6.9. No patch or official fix information is currently provided.
CVSS v4.0
Score 6.9medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based buffer overflow in the iked process of WatchGuard Fireware OS. An authenticated administrator can exploit this by saving a specially crafted configuration, which causes the IKE daemon (iked) to crash, resulting in denial of service. The vulnerability is identified as CWE-122 and CWE-1284. It affects versions 2025.0 and 12.0 of Fireware OS. The CVSS 4.0 base score is 6.9, reflecting network attack vector, low attack complexity, and high privileges required.
Potential Impact
The impact is a denial of service condition caused by crashing the IKE daemon (iked) on affected Fireware OS versions. This disrupts VPN or IPsec services relying on the IKE daemon. No information about code execution or data disclosure is provided.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict administrative access to trusted personnel only and avoid saving untrusted configurations.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vjp6-wxgv-jj73
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-81851"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
Threat ID: 6a91a7dcacd9273b490658c6
Added to database: 08/28/2026, 15:23:08 UTC
Last enriched: 09/10/2026, 00:08:19 UTC
Last updated: 10/13/2026, 18:48:24 UTC
Views: 80
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