PT-2025-31441 · Vproxy · Vproxy

David Bohannon + 1 · CVE-2025-54581 · Published 2025-07-30 · Updated 2025-07-31

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions vproxy versions 2.3.3 and below

Description vproxy is an HTTP/HTTPS/SOCKS5 proxy server. Untrusted data from the user-controlled HTTP Proxy-Authorization header is passed to Extension::try from and then to parse ttl extension where it is parsed as a TTL value. Supplying a TTL value of zero via the username in the Proxy-Authorization header (e.g., 'configuredUser-ttl-0') causes a division by zero panic in the timestamp % ttl modulo operation, leading to a denial-of-service condition and server crash.

Recommendations Upgrade to vproxy version 2.4.0 or later.

Exploit

Fix

DoS

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

BDU:2026-00065

CVE-2025-54581

GHSA-7H24-C332-P48C

Affected Products

Vproxy

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54581.json · Exploit
• https://osv.dev/vulnerability/GHSA-7h24-c332-p48c · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00065 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-54581 · Security Note
• https://osv.dev/vulnerability/CVE-2025-54581 · Vendor Advisory
• https://github.com/0x676e67/vproxy/security/advisories/GHSA-7h24-c332-p48c · Note
• https://github.com/0x676e67/vproxy/commit/aa1bf64c5e7f1c471395f9f29175ffc1b16a1079 · Note
• https://github.com/0x676e67/vproxy/releases/tag/v2.4.0 · Note
• https://github.com/0x676e67/vproxy · Note
• https://t.me/CVEtracker/28782 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1950717540474261670 · Twitter Post
• https://twitter.com/CVEnew/status/1950651995985002623 · Twitter Post