CVE-2023-43669

Name: CVE-2023-43669
Creator: NVD / NIST
Published: 2023-09-21T06:15:13.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.62%

Last modified Jun 17, 2026

CVE-2023-43669 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 1.62% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.62%

73.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Snapview	Tungstenite	<= 0.20.0
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38
Fedoraproject	Fedora	39

References

https://bugzilla.redhat.com/show_bug.cgi?id=2240110Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1215563Issue Tracking, Third Party Advisory
https://crates.io/crates/tungstenite/versionsRelease Notes
https://cwe.mitre.org/data/definitions/407.htmlTechnical Description
https://github.com/advisories/GHSA-9mcr-873m-xcxpThird Party Advisory
https://github.com/github/advisory-database/pull/2752Patch
https://github.com/snapview/tungstenite-rs/commit/8b3ecd3cc0008145ab4bc8d0657c39d09db8c7e2Patch
https://github.com/snapview/tungstenite-rs/issues/376Exploit, Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D/Mailing List, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2023-43669Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2240110Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1215563Issue Tracking, Third Party Advisory
https://crates.io/crates/tungstenite/versionsRelease Notes
https://cwe.mitre.org/data/definitions/407.htmlTechnical Description
https://github.com/advisories/GHSA-9mcr-873m-xcxpThird Party Advisory
https://github.com/github/advisory-database/pull/2752Patch
https://github.com/snapview/tungstenite-rs/commit/8b3ecd3cc0008145ab4bc8d0657c39d09db8c7e2Patch
https://github.com/snapview/tungstenite-rs/issues/376Exploit, Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D/Mailing List, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2023-43669Third Party Advisory

Timeline

Published: Sep 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-43669?

How severe is CVE-2023-43669?

CVE-2023-43669 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.62% probability of exploitation in the next 30 days.

How do I fix CVE-2023-43669?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-43669?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST