CVE-2025-54581

vproxy is vulnerable to a divide by zero DoS attack

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Affected: 0x676e67 vproxy
Published at:
Updated at:

References

Link Tags
https://github.com/0x676e67/vproxy/security/advisories/GHSA-7h24-c332-p48c
https://github.com/0x676e67/vproxy/commit/aa1bf64c5e7f1c471395f9f29175ffc1b16a1079
https://github.com/0x676e67/vproxy/releases/tag/v2.4.0

Frequently Asked Questions

What is the severity of CVE-2025-54581?
CVE-2025-54581 has been scored as a high severity vulnerability.
How to fix CVE-2025-54581?
To fix CVE-2025-54581, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-54581 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-54581 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-54581?
CVE-2025-54581 affects 0x676e67 vproxy.
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