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CVE-2026-86133— Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote 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 的 IKE 守护进程（iked）中存在一个整数下溢漏洞。已初步完成 IKEv2 握手的远程攻击者可通过发送特制的加密 IKEv2 消息，导致 iked 进程崩溃，从而引发拒绝服务（DoS）攻击。

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-86133

Vulnerability Information
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Vulnerability Title
Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
An integer underflow vulnerability in the WatchGuard Fireware OS IKE daemon (iked) allows a remote attacker who has completed the initial IKEv2 handshake to crash the iked process by sending a specially crafted encrypted IKEv2 message, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WatchGuard Fireware OS 2026.3 ~ 2026.3.2 -
WatchGuard Fireware OS 12.0 ~ 12.5.21 -

II. Public POCs for CVE-2026-86133

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III. Intelligence Information for CVE-2026-86133

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Other References for CVE-2026-86133 (1)

Same Patch Batch · WatchGuard · 2026-09-29 · 14 CVEs total

CVE-2026-86131 9.2 CRITICAL Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution
CVE-2026-81433 8.7 HIGH Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Executi
CVE-2026-86104 8.7 HIGH Fireware OS Resource Exhaustion in Login Process Allows Denial of Service
CVE-2026-18145 8.6 HIGH Fireware OS Stack-based Buffer Overflow in spamd Allows Remote Code Execution
CVE-2026-13224 8.2 HIGH Fireware OS Path Traversal in WebUI Management Agent Allows Arbitrary Local File Read
CVE-2026-86128 8.2 HIGH Fireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Deni
CVE-2026-86132 8.2 HIGH Fireware OS Pre-Authentication Integer Underflow in iked Allows Denial of Service
CVE-2026-13046 7.5 HIGH Fireware OS Deserialization of Untrusted Data in samld Allows Remote Code Execution
CVE-2026-86101 7.2 HIGH Fireware OS Authorization Bypass in SAML Login Allows Unauthorized SSLVPN Access
CVE-2026-90441 7.1 HIGH Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Var
CVE-2026-18105 7.1 HIGH Fireware OS Uncontrolled Resource Consumption in Diagnostic Tasks Allows Denial of Service
CVE-2026-86136 7.1 HIGH Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Var
CVE-2026-86105 5.3 MEDIUM Fireware OS Improper Authorization in Access Portal Reverse Proxy

IV. Related Vulnerabilities

Same product: Fireware OS
Same vendor: WatchGuard
Same weakness: CWE-1284

V. Comments for CVE-2026-86133

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