# CVE-2025-54581

## Summary

- **CVE ID:** CVE-2025-54581
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-369
- **Published:** Jul 30, 2025
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- 0x676e67 — vproxy (< 2.4.0)

## References

- [CNA](https://github.com/0x676e67/vproxy/security/advisories/GHSA-7h24-c332-p48c)
- [CNA](https://github.com/0x676e67/vproxy/commit/aa1bf64c5e7f1c471395f9f29175ffc1b16a1079)
- [CNA](https://github.com/0x676e67/vproxy/releases/tag/v2.4.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.54%
- **EPSS Percentile:** 43.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._