Division by zero Affecting vproxy package, versions <2.4.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-VPROXY-11343423
- published31 Jul 2025
- disclosed30 Jul 2025
- creditUnknown
Introduced: 30 Jul 2025
NewCVE-2025-54581 (opens in a new tab)How to fix?
Upgrade vproxy to version 2.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Division by zero via the parse_ttl_extension function in the extension.rs file. An attacker can cause the server to crash by supplying a specially crafted HTTP Proxy-Authorization header with a TTL value of zero, resulting in a division by zero during the modulo operation.
PoC
- Send a cUrl request like the following, adjusting address and port as necessary: ;curl -x "http://test-ttl-0:test@127.0.0.1:8101" https://google.com;
- Wait for a cUrl error indicating "Proxy CONNECT aborted"
- View logs from the vproxy server
- Observe that the vproxy server crashed due to a divide-by-zero panic