EUVD-2026-18302
GHSA-8x7f-x496-fp9r
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/vpnfw.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.
AnalysisAI
Stored cross-site scripting (XSS) in Endian Firewall 3.3.25 and earlier allows authenticated attackers to inject arbitrary JavaScript via the remark parameter in /cgi-bin/vpnfw.cgi, which persists and executes when other users access the affected page. CVSS 5.1 reflects low immediate confidentiality/integrity impact but user interaction requirement; the vulnerability requires authenticated access (PR:L), limiting blast radius compared to unauthenticated XSS.
Technical ContextAI
The vulnerability exists in the VPN firewall CGI handler (vpnfw.cgi) where user-supplied input in the remark parameter is stored without proper sanitization and later reflected in rendered HTML without output encoding. This is a classic stored XSS vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation). The attack vector is network-based over HTTP/HTTPS, but exploitation requires valid authentication credentials to access the affected endpoint and inject the payload.
RemediationAI
Upgrade Endian Firewall to a patched version beyond 3.3.25 (exact fixed version not specified in available data; consult Endian advisory for version confirmation). If immediate patching is unavailable, mitigate by restricting access to /cgi-bin/vpnfw.cgi through network firewall rules, limiting VPN admin interface exposure to trusted administrative networks, and disabling the remark feature if operationally feasible. Additional context and technical details available at https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-vpnfw-cgi-remark-stored-cross-site-scripting
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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