CVE-2025-54581: 0x676e67 Vproxy

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• 0x676e67 Vproxy: before 2.4.0 (fixed in 2.4.0)

Published 2025-07-30. Last modified 2026-06-17.