CVE-2026-81851 MEDIUM

CVE-2026-81851: Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service

Vendor Watchguard
Product Fireware OS
Weakness CWE-122
Published August 27, 2026
Last update August 28, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.

Key dates

02Disclosure timeline

August 27, 2026 CVE published
August 28, 2026 Record updated