WatchGuard Firebox Out of Bounds Write Vulnerability
An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 5 / 5
- KEV catalog (CISA)19 Dec 2025
- Exploited in EUVD (ENISA)19 Dec 2025
- Used by ransomwareyes
- EPSS above 10 %29.4%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the mobile user VPN with IKEv2 and the branch office VPN using IKEv2 when configured with a dynamic gateway peer. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.
Affected products
- 12.0 <12.11.6
- 11.10.2 ≤11.12.4+541730
- 12.0 <12.5.15
- 12.0 <12.3.1+728352
- 2025.1 <2025.1.4
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
-
EPSS peak: 29.4%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-9242WatchGuard Firebox Out-of-Bounds Write Vulnerability8.9 · Background exploitation
- CVE-2022-23176WatchGuard Firebox and XTM Privilege Escalation Vulnerability5.6 · Background exploitation
- CVE-2022-26318WatchGuard Firebox and XTM Appliances Arbitrary Code Execution8.7 · Background exploitation