# CVE-2026-112710: Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code Execution

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

A heap-based buffer overflow vulnerability exists in the Fireware OS authentication service allows an attacker who controls or intercepts traffic to the configured Active Directory server to create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.

## 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: 9.2 (critical); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: WatchGuard

- CISA KEV: No listing in collected sources

- EPSS: 0.42% as of 2026-11-04; percentile 36.40%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-122, CWE-131

## Exploit evidence

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

## References

- https://psirt.watchguard.com/CVE-2026-112710 (CNA: WatchGuard; vendor-advisory)

## Provenance

- CNA: WatchGuard: https://www.cve.org/CVERecord?id=CVE-2026-112710; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-112710; retrieved 2026-11-04; source updated Not reported

Revision: 920c8ec3d661ccd20508ba18ea7c5c83fe5b9c95a2ca72f4610b394016ceb963

Canonical: https://y2.dev/cve/CVE-2026-112710

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