9.2
CriticalCVSS 4.0 · from WatchGuard
CVE-2026-112709
Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Remote Code Execution
Fireware OS · Heap buffer overflow · CWE-122AffectedFireware OS, Fireware OS
FixUpdate to 2026.4, 12.12.4, 12.5.22 or newer
PublishedOct 27, 15:52 · WatchGuard
ScoredOct 27 · 9.2 · WatchGuard
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:09 UTC
What we know
No known exploitation. CISA KEV, checked 22:09 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
It only works under certain conditions, which makes it harder to pull off. CVSS: high attack complexity.
A successful attack can read and change data and take the service down. CVSS: high impact on confidentiality, integrity and availability.
Description
A heap-based buffer overflow vulnerability 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.
From WatchGuard
Affected and fixed versions
ProductAffectedFixed inFireware OS2025.1 – before 2026.42026.4Fireware OS12.0 – before 12.12.412.12.4Fireware OS12.0 – before 12.5.2212.5.22
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known