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TI-2025-34354 Aliases CVE-2025-54581GHSA-7h24-c332-p48c

vproxy is vulnerable to a divide by zero DoS attack

Priority MEDIUM 40CWE-369Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-369.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00642 51st percentileScored 2026-11-07
Fix Fixed vproxy (0x676e67): 2.4.0vproxy (crates.io): 2.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
0x676e67vproxybefore 2.4.02.4.0Patch availableCNA
—vproxy (crates.io)before 2.4.02.4.0Patch availableGHSA-7h24-c332-p48c
  • vproxy Vendor0x676e67 Affected before 2.4.0 Fixed in 2.4.0 Patch available CNA
  • vproxy (crates.io) Vendor— Affected before 2.4.0 Fixed in 2.4.0 Patch available GHSA-7h24-c332-p48c

Remediation

  • Fix · CNA vproxy (0x676e67) Fixed in 2.4.0
  • Fix · GHSA-7h24-c332-p48c vproxy (crates.io) Fixed in 2.4.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-54581
  2. 2026-10-03 Alias added: GHSA-7h24-c332-p48c
  3. 2026-10-31 EPSS moved to the 50th–90th percentile

References

Advisory 1

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences