CVE-2026-90442— Fireware OS Authenticated Stack Buffer Overflow in certd 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 中的 certd 进程存在基于栈的缓冲区溢出漏洞。已认证的攻击者若能够访问 Firebox 管理界面，可通过发送特制请求导致证书管理服务崩溃，并可能借此执行任意代码。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-90442
Vulnerability Information
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Vulnerability Title
Fireware OS Authenticated Stack Buffer Overflow in certd Allows Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
A stack-based buffer overflow vulnerability in the Fireware OS certd process allows an authenticated attacker with access to the Firebox management interface to crash the certificate management service and potentially execute arbitrary code by sending a specially crafted request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
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-2026-90442
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-90442 (1)
-
https://psirt.watchguard.com/CVE-2026-90442 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-2026-93865 | 9.2 CRITICAL | Fireware OS Missing Authentication in FireCluster Sync Daemon Allows Remote Root Action In |
| 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-2026-103593 | 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-2026-90464 | 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-2026-104381 | 6.0 MEDIUM | Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN Tunnel Denial of |
| 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-2026-82332
Fireware OS Improper Authentication in AuthPoint MFA Verific -
CVE-2026-103594
Fireware OS Stack Buffer Overflow in WireGuard Configuration -
CVE-2026-103593
Fireware OS Stack Buffer Overflow in Logging Service Allows
Same vendor: WatchGuard
-
CVE-2026-115495
Mobile VPN with SSL Client for Windows: Cleartext Transmissi -
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-2026-111107
Fireware OS NULL Pointer Dereference in Management Interface -
CVE-2026-103593
Fireware OS Stack Buffer Overflow in Logging Service Allows
Same weakness: CWE-121
-
CVE-2026-48379
Substance3D - Painter | Stack-based Buffer Overflow (CWE-121 -
CVE-2026-103593
Fireware OS Stack Buffer Overflow in Logging Service Allows -
CVE-2026-103594
Fireware OS Stack Buffer Overflow in WireGuard Configuration -
CVE-2026-113881
Fireware OS Stack Buffer Overflow in VPN Network Access Enfo -
CVE-2026-90725
Dell PowerProtect Data Domain 多版本栈缓冲区溢出漏洞