CVE-2026-90442

Fireware OS Authenticated Stack Buffer Overflow in certd Allows Denial of Service

Published Oct 27, 2026 CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Description
A stack-based buffer overflow vulnerability in the Fireware OS certd process allows an authenticated attacker with access to the Firebox management interface to crash the certificate management service and potentially execute arbitrary code by sending a specially crafted request.

Remediation

Vendor Solution

Fireware OS 2026.4, Fireware OS 12.12.4, Fireware OS 12.5.22

Tracking

Sign in to view the affected projects.

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 certd process allows an authenticated attacker with access to the Firebox management interface to crash the certificate management service and potentially execute arbitrary code by sending a specially crafted request.
Title Fireware OS Authenticated Stack Buffer Overflow in certd Allows Denial of Service
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': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Nov 4, 2026, 8:26 PM
Reserved
Sep 11, 2026, 8:58 PM
Status
Awaiting Analysis
Published
Oct 27, 2026, 4:17 PM
Modified
Nov 4, 2026, 9:18 PM