CVE-2025-54581 – Vproxy HTTP Proxy-Authorization Header DoS Vulnerability

CVE ID : CVE-2025-54581

Published : July 30, 2025, 8:15 p.m. | 1 hour, 14 minutes ago

Description : vproxy is an HTTP/HTTPS/SOCKS5 proxy server. In versions 2.3.3 and below, untrusted data is extracted from the user-controlled HTTP Proxy-Authorization header and passed to Extension::try_from and flows into parse_ttl_extension where it is parsed as a TTL value. If an attacker supplies a TTL of zero (e.g. by using a username such as ‘configuredUser-ttl-0’), the modulo operation ‘timestamp % ttl’ will cause a division by zero panic, causing the server to crash causing a denial-of-service. This is fixed in version 2.4.0.

Severity: 7.5 | HIGH

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