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.
Fireware OS 的 iked 进程中存在一个基于堆的缓冲区溢出漏洞。一个经过身份验证的 administrator（管理员）可以通过保存一个特制的配置文件来触发该漏洞，导致 IKE 守护进程（iked）崩溃，从而造成服务拒绝（DoS）。
Possible ATT&CK Techniques 1 AI
T1027 · Obfuscated Files or InformationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 |
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I. Basic Information for CVE-2026-81851
Vulnerability Information
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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
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 |
|---|
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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 → →
IV. Related Vulnerabilities
Same product: Fireware OS
-
CVE-2026-19315
Fireware OS Pre-Authentication Type Confusion in iked Allows -
CVE-2026-78011
Fireware OS Integer Underflow in Iked Allows Unauthenticated -
CVE-2026-78010
Fireware OS Stack-Based Buffer Overflow in iked Allows Unaut -
CVE-2026-78008
Fireware OS Authenticated Buffer Overflow in wgagent -
CVE-2026-78009
Fireware OS Out-of-Bounds Read in iked Allows Unauthenticate
Same vendor: WatchGuard
-
CVE-2026-78498
Dimension Server-Side Request Forgery via Email Server Test -
CVE-2026-78616
Dimension Stored XSS via Trusted CA Certificate Configuratio -
CVE-2026-78612
Dimension SQL Injection in Scheduled Report -
CVE-2026-78047
Dimension Stored XSS in Scheduled Report Task -
CVE-2026-78499
Dimension SSRF via FTP Server Test Connection
Same weakness: CWE-122
-
CVE-2026-38821
openNDS 11.0.0 前堆缓冲区溢出漏洞 -
CVE-2026-19313
Fireware OS Pre-Authentication Heap Buffer Overflow in iked -
CVE-2026-34674
Substance3D - Sampler | Heap-based Buffer Overflow (CWE-122) -
CVE-2026-77652
Dia: dia: heap buffer overflow in wpg colormap parser via ou -
CVE-2026-77532
EdgeMAX EdgeSwitch DHCPv6缓冲区溢出致远程代码执行
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