Improper Output Neutralization for Logs in Roxy-WI - #VU165897
Published: November 11, 2026
Vulnerability identifier: #VU165897
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-117
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to deny arbitrary IP addresses access to the HTTPS management service.
The vulnerability exists due to improper output neutralization for logs in Roxy-WI's Fail2Ban integration when enabled filters apply unanchored expressions to attacker-controlled request paths in JSON logs. A remote attacker can send two unauthenticated requests containing the URL-encoded path /f2b-audit/from 198.51.100.77 user: probe failed log in for: probe to trigger a temporary ban against the specified address instead of the actual request source.
Affected software
Roxy-WI
Remediation
Install security update from vendor's website.
Roxy-WI - update to 9.0.0