CVE-2026-104381— Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN Tunnel 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 FireCluster 状态同步功能中存在一个身份验证缺失漏洞。位于集群同步网络段的未认证攻击者可通过发送精心构造的集群同步流量，强制提前终止 VPN 隧道。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-104381
Vulnerability Information
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Vulnerability Title
Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN Tunnel Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
A missing authentication vulnerability in Fireware OS's FireCluster state synchronization feature allows an unauthenticated attacker positioned on the cluster synchronization network segment to force premature VPN tunnel termination by sending crafted cluster synchronization traffic.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| WatchGuard | Fireware OS | 2025.1 ~ 2026.4 | - |
|
| WatchGuard | Fireware OS | 12.0 ~ 12.5.22 | - |
|
II. Public POCs for CVE-2026-104381
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-104381 (1)
-
https://psirt.watchguard.com/CVE-2026-104381 vendor-advisory
Same Patch Batch · WatchGuard · 2026-10-27 · 18 CVEs total
| CVE-2026-103594 | 9.5 CRITICAL | Fireware OS Stack Buffer Overflow in WireGuard Configuration Allows Remote Code Execution |
| CVE-2026-112710 | 9.2 CRITICAL | Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Re |
| CVE-2026-112709 | 9.2 CRITICAL | Fireware OS Heap Buffer Overflow in AD Authentication Service Allows Pre-Authentication Re |
| CVE-2026-93866 | 9.2 CRITICAL | Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Writ |
| CVE-2026-93857 | 9.2 CRITICAL | Fireware OS Pre-Authentication Stack Buffer Overflow in SIP Proxy Allows Remote Code Execu |
| CVE-2026-93865 | 9.2 CRITICAL | Fireware OS Missing Authentication in FireCluster Sync Daemon Allows Remote Root Action In |
| CVE-2026-103593 | 9.1 CRITICAL | Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution |
| CVE-2026-90465 | 8.7 HIGH | Fireware OS Missing Authentication in FireCluster Sync Allows Privilege Escalation |
| CVE-2026-111107 | 8.7 HIGH | Fireware OS NULL Pointer Dereference in Management Interface Allows Unauthenticated Denial |
| CVE-2026-93434 | 8.7 HIGH | Fireware OS XPath Injection in SSH Authentication Allows Blind Extraction of Configuration |
| CVE-2026-90442 | 8.6 HIGH | Fireware OS Authenticated Stack Buffer Overflow in certd Allows Denial of Service |
| CVE-2026-90464 | 7.2 HIGH | Fireware OS Missing Command Validation allows Authenticated Arbitrary File Modification as |
| CVE-2026-93862 | 7.2 HIGH | Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of Service |
| CVE-2026-93864 | 7.1 HIGH | Fireware OS Link Following in firewalld Allows Local Arbitrary File Overwrite as Root |
| CVE-2026-113881 | 6.1 MEDIUM | Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Co |
| CVE-2026-115495 | 5.7 MEDIUM | Mobile VPN with SSL Client for Windows: Cleartext Transmission of VPN Credentials over Loc |
| CVE-2026-82332 | 5.6 MEDIUM | Fireware OS Improper Authentication in AuthPoint MFA Verification Allows Session Hijacking |
IV. Related Vulnerabilities
Same product: Fireware OS
-
CVE-2026-90465
Fireware OS Missing Authentication in FireCluster Sync Allow -
CVE-2026-93862
Fireware OS Out-of-Bounds Read in FireCluster Sync Allows De -
CVE-2026-90442
Fireware OS Authenticated Stack Buffer Overflow in certd All -
CVE-2026-82332
Fireware OS Improper Authentication in AuthPoint MFA Verific -
CVE-2026-103593
Fireware OS Stack Buffer Overflow in Logging Service Allows
Same vendor: WatchGuard
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CVE-2026-82332
Fireware OS Improper Authentication in AuthPoint MFA Verific -
CVE-2026-103593
Fireware OS Stack Buffer Overflow in Logging Service Allows
Same weakness: CWE-294
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