CVE-2026-3987— WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI
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 Firebox Fireware OS是美国WatchGuard公司的一款为防火墙设备提供安全防护与流量控制能力的操作系统。 WatchGuard Firebox Fireware OS 12.6.1至12.11.8版本和2025.1至2026.1.2版本存在安全漏洞，该漏洞源于Web UI存在路径遍历，可能导致经过身份验证的远程特权攻击者在提升的系统进程环境中执行任意代码。
Possible ATT&CK Techniques 2 AI
T1195 · Supply Chain Compromise T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| WatchGuard | Fireware OS | 2025.1< 2026.2 |
affected |
12.6.1< 12.12 |
affected |
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I. Basic Information for CVE-2026-3987
Vulnerability Information
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Vulnerability Title
WatchGuard Firebox Arbitrary File Write vis Path Traversal in Fireware Web UI
Source: CVE Program / CVE List V5
Vulnerability Description
A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged authenticated remote attacker to execute arbitrary code in the context of an elevated system process.
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:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
WatchGuard Firebox Fireware OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WatchGuard Firebox Fireware OS是美国WatchGuard公司的一款为防火墙设备提供安全防护与流量控制能力的操作系统。 WatchGuard Firebox Fireware OS 12.6.1至12.11.8版本和2025.1至2026.1.2版本存在安全漏洞，该漏洞源于Web UI存在路径遍历，可能导致经过身份验证的远程特权攻击者在提升的系统进程环境中执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| WatchGuard | Fireware OS | 2025.1 ~ 2026.2 | - |
|
II. Public POCs for CVE-2026-3987
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-3987 (1)
IV. Related Vulnerabilities
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Same weakness: CWE-22
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V. Comments for CVE-2026-3987
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