CVE-2026-103593#
Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
Summary #
A stack-based buffer overflow vulnerability in the Fireware OS logging service allows a network-adjacent attacker who can impersonate or intercept traffic to the configured log server to execute arbitrary code with root privileges by presenting a specially crafted certificate.
Product status #
| Product | Affected | Not affected |
|---|---|---|
| Fireware OS | ||
| Default | >= 2025.1, < 2026.4, >= 12.0, < 12.12.4 | >= 2026.4, >= 12.12.4 |
| T15/T35 | >= 12.0, < 12.5.22 | >= 12.5.22 |
Required Configuration for Exposure #
This vulnerability affects Firebox deployments in FIPS mode with an external log server configured.
Weakness Type and Impact #
Exploitation Status #
WatchGuard is not aware of any exploitation of this vulnerability in the wild.
Solution #
Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22
References #
Credits #
- WatchGuard AI Security Researchfinder