# CVE-2023-43669: rust-tungstenite: The Tungstenite crate before 0.20.1 for Rust allows remote attackers to cause a denial of service (minutes of CPU con...

CVE-2023-43669 is fixed in rust-tungstenite on 1 platform, first by DEBIAN-CVE-2023-43669, released September 21, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-43669
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0206
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 21, 2023

## Description

The Tungstenite crate before 0.20.1 for Rust allows remote attackers to cause a denial of service (minutes of CPU consumption) via an excessive length of an HTTP header in a client handshake. The length affects both how many times a parse is attempted (e.g., thousands of times) and the average amount of data for each parse attempt (e.g., millions of bytes).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rust-tungstenite Debian 13.5 (trixie) | 0.20.1-1 | [DEBIAN-CVE-2023-43669](https://patchblox.com/security/data/fix/linux/debian-cve-2023-43669.md) | Sep 21, 2023 |
| Linux | rust-tungstenite Debian 14 | 0.20.1-1 | [DEBIAN-CVE-2023-43669](https://patchblox.com/security/data/fix/linux/debian-cve-2023-43669.md) | Sep 21, 2023 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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