CVE-2026-81433

Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution

Published Sep 29, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
A stack-based buffer overflow vulnerability in WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.

Remediation

Vendor Solution

Fireware OS 2026.3.2, Fireware OS 2026.2.3, Fireware OS 12.12.3

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 WatchGuard Fireware OS's DHCP fingerprinting daemon (fingerd) allows an unauthenticated attacker with adjacent network access to execute arbitrary code or crash the process by sending a specially crafted DHCP packet.
Title Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Execution
First Time appeared Watchguard
Watchguard fireware Os
Weaknesses CWE-120
CWE-121
CWE-787
CPEs cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
Vendors & Products Watchguard
Watchguard fireware Os
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Oct 1, 2026, 3:55 AM
Reserved
Aug 26, 2026, 7:25 PM
Status
Deferred
Published
Sep 30, 2026, 12:16 AM
Modified
Oct 1, 2026, 4:18 AM