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CVE-2026-86104— Fireware OS Resource Exhaustion in Login Process 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 登录过程（wgagent）中存在一个不受控制资源消耗的漏洞，允许远程未经身份验证的攻击者通过发送特殊构造的请求导致服务不可用（拒绝服务）。

CVSS 8.7 · High
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I. Basic Information for CVE-2026-86104

Vulnerability Information
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Vulnerability Title
Fireware OS Resource Exhaustion in Login Process Allows Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
An uncontrolled resource consumption vulnerability in the Fireware OS login process (wgagent) allows a remote, unauthenticated attacker to cause a denial of service by sending a specially crafted request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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-2026-86104

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III. Intelligence Information for CVE-2026-86104

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Other References for CVE-2026-86104 (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-2026-18145 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-2026-86133 8.2 HIGH Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote 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-400

V. Comments for CVE-2026-86104

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