{"cve":"CVE-2023-43669","nvd":{"published":"2023-09-21T06:15:13.833","modified":"2026-06-17T06:26:11.990","status":"Modified","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":[],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=2240110","https://bugzilla.suse.com/show_bug.cgi?id=1215563","https://crates.io/crates/tungstenite/versions","https://cwe.mitre.org/data/definitions/407.html","https://github.com/advisories/GHSA-9mcr-873m-xcxp"],"products":["fedoraproject:fedora","snapview:tungstenite"],"source":"nvd","synced_at":"2026-10-19T21:39:24.235896374+00:00"},"epss":{"cve":"CVE-2023-43669","score":0.02057,"percentile":0.81303,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9mcr-873m-xcxp","url":"https://osv.dev/vulnerability/GHSA-9mcr-873m-xcxp","summary":"Tungstenite allows remote attackers to cause a denial of service","modified":"2026-09-10T03:49:58.067916445Z","packages":[{"ecosystem":"crates.io","name":"tungstenite","purl":"pkg:cargo/tungstenite","ranges":["<0.20.1"],"fixed":["0.20.1"]}]},{"id":"RUSTSEC-2023-0065","url":"https://osv.dev/vulnerability/RUSTSEC-2023-0065","summary":"Tungstenite allows remote attackers to cause a denial of service","modified":"2023-11-08T04:13:32.776663Z","packages":[{"ecosystem":"crates.io","name":"tungstenite","purl":"pkg:cargo/tungstenite","ranges":[">=0.0.0-0 <0.20.1"],"fixed":["0.20.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}