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

Status: published. Published: 2026-10-27. Updated: 2026-11-04.

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.

## Remediation

- fix: Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22 (source: CNA: WatchGuard)

## Affected products and versions

- WatchGuard / Fireware OS: ≥ 2025.1; < 2026.4 (affected, custom); ≥ 12.0; < 12.12.4 (affected, custom). Source: CNA: WatchGuard; platforms: Default
- WatchGuard / Fireware OS: ≥ 12.0; < 12.5.22 (affected, custom). Source: CNA: WatchGuard; platforms: T15/T35

## Severity and prioritization

- CVSS 4.0: 8.7 (high); 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; source: CNA: WatchGuard

- CISA KEV: No listing in collected sources

- EPSS: 0.36% as of 2026-11-04; percentile 29.41%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-1286, CWE-248, CWE-476

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://psirt.watchguard.com/CVE-2026-111107 (CNA: WatchGuard; vendor-advisory)

## Provenance

- CNA: WatchGuard: https://www.cve.org/CVERecord?id=CVE-2026-111107; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-111107; retrieved 2026-11-04; source updated Not reported

Revision: 28598ba9c4f00eb614a16318538feca9522a03a12db71350ba889014c5185308

Canonical: https://y2.dev/cve/CVE-2026-111107

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