Vulnerability · Published Oct 27, 2026 · Assigned by WatchGuard

CVE-2026-111107Fireware OS NULL Pointer Dereference in Management Interface Allows Unauthenticated Denial of Service

High 8.7

In plain English

A high-severity null pointer dereference in Fireware OS from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.4%top 70.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request. Repeated exploitation terminates all active administrator sessions and in-progress management operations and can prevent management of the device. Traffic processing is not affected.

Affected products (as reported)

Vendor	Product	Versions
WatchGuard	Fireware OS	2025.1 – before 2026.412.0 – before 12.12.4
WatchGuard	Fireware OS	12.0 – before 12.5.22

Weakness: CWE-1286, CWE-248, CWE-476 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://psirt.watchguard.com/CVE-2026-111107 vendor-advisory