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Vulnerability record · CVE-2026-3987 · published 1 April 2026

CVE-2026-3987: Watchguard fireware path traversal vulnerability

Watchguard · Fireware

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.

8.6 CVSS 4.0 High EPSS 1.1% · top 37.0% CWE-22 · Path traversal
8.6CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
14 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://psirt.watchguard.com/CVE-2026-3987 Broken Link
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00009 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-26318WatchGuard Fireware OS unauthenticated remote code executionWatchGuard Firebox and XTM appliances running Fireware OS contain an unauthenticated remote code execution flaw tracked as FBX-22786. An attacker who…KEVEPSS 78%analysed9.3CVE-2025-14733WatchGuard Fireware iked out-of-bounds write allows remote code executionWatchGuard Fireware OS contains an out-of-bounds write in the iked process reachable over the network. It affects IKEv2 mobile user VPN and branch of…KEVEPSS 27%analysed9.3CVE-2025-9242WatchGuard Fireware OS iked out-of-bounds writeWatchGuard Fireware OS contains an out-of-bounds write in the iked process that can let a remote, unauthenticated attacker execute arbitrary code. It…KEVEPSS 91%analysed8.8CVE-2022-23176WatchGuard Fireware management access privilege escalationWatchGuard Firebox and XTM appliances running Fireware OS allow a remote attacker holding unprivileged credentials to obtain a privileged management …KEVEPSS 11%analysed9.8CVE-2022-31789Watchguard fireware integer overflow vulnerabilityAn integer overflow in WatchGuard Firebox and XTM appliances allows an unauthenticated remote attacker to trigger a buffer overflow and potentially e…EPSS 1.9%9.3CVE-2013-6021Watchguard fireware memory buffer overflow vulnerabilityBuffer overflow in WGagent in WatchGuard WSM and Fireware before 11.8 allows remote attackers to execute arbitrary code via a long sessionid value in…EPSS 12%9.2CVE-2026-13368Watchguard fireware use after free vulnerabilityWatchGuard Fireware OS contains a race condition leading to a use-after-free vulnerability in LDAP authentication for the Mobile User VPN with IKEv2.…EPSS 0.94%9.1CVE-2022-25361Watchguard fireware vulnerabilityWatchGuard Firebox and XTM appliances allow an unauthenticated remote attacker to delete arbitrary files from a limited set of directories on the sys…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-3987), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.