Is CVE-2025-11838 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-11838 being exploited in the wild.

How severe is CVE-2025-11838?

High severity, with a CVSS score of 7.5, published 4 December 2025.

Which products and versions are affected?

Watchguard Fireware OS 2025.1 to 2025.1.3, 12.6.1 to 12.11.5.

Is there a fix for CVE-2025-11838?

A patch was published on 2025-12-04: Fixes available in Fireware OS 2025.1.3 and 12.11.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2025-11838 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2025-11838?

Check whether you run Watchguard Fireware OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2025-11838: WatchGuard Fireware OS memory corruption DoS in IKEv2 VPN

CVE-2025-11838 · Severity: high · CVSS 7.5 · Published 2025-12-04

WatchGuard Fireware OS powers firewalls and VPN gateways that protect corporate networks and enable remote workers to connect securely. A memory corruption flaw in the IKEv2 VPN implementation allows unauthenticated remote attackers to crash the VPN service, disrupting access for mobile and branch office users. No patches are available for affected versions.

Technologies: Watchguard Fireware OS. Vendors: Watchguard.

Quick answers

Is CVE-2025-11838 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-11838 being exploited in the wild.
How severe is CVE-2025-11838?: High severity, with a CVSS score of 7.5, published 4 December 2025.
Which products and versions are affected?: Watchguard Fireware OS 2025.1 to 2025.1.3, 12.6.1 to 12.11.5.
Is there a fix for CVE-2025-11838?: A patch was published on 2025-12-04: Fixes available in Fireware OS 2025.1.3 and 12.11.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-11838 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2025-11838?: Check whether you run Watchguard Fireware OS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This vulnerability is a memory corruption issue (CWE-763: release of invalid pointer or reference) in the iked (IKE daemon) component that handles Mobile User VPN with IKEv2 and Branch Office VPN with IKEv2 when configured with a dynamic gateway peer. The flaw is reachable over the network without authentication. An attacker can send crafted IKE packets to trigger the memory corruption and cause a denial of service by crashing the iked daemon. The vulnerability affects Fireware OS versions 2025.1 through 2025.1.3 and 12.6.1 through 12.11.5, with fixes available in versions 2025.1.3 and 12.11.5.

Affected products

WatchGuard Fireware OS 2025.1 to 2025.1.3, 12.6.1 to 12.11.5

Timeline

2025-12-04: disclosed
2025-12-04: patched: Fixes available in Fireware OS 2025.1.3 and 12.11.5

References

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