Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
WatchGuard Fireware OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WatchGuard Fireware OS是美国WatchGuard公司的一款防火墙操作系统。 WatchGuard Fireware OS 2025.0至2026.2.1之前版本、12.0至12.12.1之前版本、12.0至12.11.9之前版本和12.0至12.5.18之前版本存在安全漏洞，该漏洞源于iked进程存在基于堆的缓冲区溢出，可能导致经过身份验证的管理员通过保存特制配置导致IKE守护进程崩溃，造成拒绝服务。

CVSS 6.9 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information

Affected Version Matrix 4

VendorProduct Version RangeStatus
WatchGuard Fireware OS 2025.0< 2026.2.1 affected
12.0< 12.12.1 affected
12.0< 12.11.9 affected
12.0< 12.5.18 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-81851

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
WatchGuard Fireware OS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WatchGuard Fireware OS是美国WatchGuard公司的一款防火墙操作系统。 WatchGuard Fireware OS 2025.0至2026.2.1之前版本、12.0至12.12.1之前版本、12.0至12.11.9之前版本和12.0至12.5.18之前版本存在安全漏洞，该漏洞源于iked进程存在基于堆的缓冲区溢出，可能导致经过身份验证的管理员通过保存特制配置导致IKE守护进程崩溃，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WatchGuard Fireware OS 2025.0 ~ 2026.2.1 -
WatchGuard Fireware OS 12.0 ~ 12.11.9 -
WatchGuard Fireware OS 12.0 ~ 12.5.18 -

II. Public POCs for CVE-2026-81851

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-81851

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-81851 (1)

Same Patch Batch · WatchGuard · 2026-08-27 · 28 CVEs total

CVE-2026-13086 9.3 CRITICAL Fireware OS Stack-Based Buffer Overflow in Mobile Security epm Endpoint
CVE-2026-19318 9.3 CRITICAL Fireware OS Pre-Authentication Stack Buffer Overflow in iked Allows Remote Code Execution
CVE-2026-78174 9.3 CRITICAL WatchGuard Dimension Session Hijack via Exposed Session Tokens in Diagnostic Logs
CVE-2026-19313 9.3 CRITICAL Fireware OS Pre-Authentication Heap Buffer Overflow in iked Allows Remote Code Execution
CVE-2026-19315 9.3 CRITICAL Fireware OS Pre-Authentication Type Confusion in iked Allows Remote Code Execution
CVE-2026-19317 8.7 HIGH Fireware OS Pre-Authentication Out-of-Bounds Read in iked Allows Denial of Service (DoS)
CVE-2026-78010 8.7 HIGH Fireware OS Stack-Based Buffer Overflow in iked Allows Unauthenticated Denial of Service
CVE-2026-78011 8.7 HIGH Fireware OS Integer Underflow in Iked Allows Unauthenticated Denial of Service (DoS)
CVE-2026-19316 8.7 HIGH Fireware OS Pre-Authentication Double Free in iked Allows Denial of Service (DoS)
CVE-2026-19314 8.7 HIGH Fireware OS Integer Underflow in iked Allows Unauthenticated Denial of Service (DoS)
CVE-2026-13108 8.7 HIGH Dimension Denial-of-Service
CVE-2026-78009 8.7 HIGH Fireware OS Out-of-Bounds Read in iked Allows Unauthenticated Denial of Service (DoS)
CVE-2026-78008 8.6 HIGH Fireware OS Authenticated Buffer Overflow in wgagent
CVE-2026-78614 8.6 HIGH Dimension SQL Injection in Audit Report
CVE-2026-78613 8.6 HIGH Dimension SQL Injection in Log Viewer
CVE-2026-78612 8.6 HIGH Dimension SQL Injection in Scheduled Report
CVE-2026-78610 8.4 HIGH Dimension CSRF Vulnerability in Administrator Passphrase Change Endpoint
CVE-2026-78618 6.9 MEDIUM Dimension Business Logic Flaw Allows Chained Backend Object Operations
CVE-2026-78617 6.3 MEDIUM WatchGuard Dimension Web UI Authentication Brute-Force Due to Missing Rate Limiting
CVE-2026-78495 5.3 MEDIUM Dimension Server-Side Request Forgery via Remote Backup Connection Test

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Fireware OS
Same vendor: WatchGuard
Same weakness: CWE-122

V. Comments for CVE-2026-81851

No comments yet

Leave a comment