CVE-2026-103593

Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution

Published Oct 27, 2026 CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
First Time appeared Watchguard
Watchguard fireware Os
Weaknesses CWE-121
CWE-787
CPEs cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard fireware Os
References
Metrics cvssV4_0

{'score': 9.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Oct 29, 2026, 10:45 AM
Reserved
Sep 30, 2026, 10:33 PM
Status
Awaiting Analysis
Published
Oct 27, 2026, 4:17 PM
Modified
Oct 29, 2026, 11:17 AM