{"id":"CVE-2023-43669","aliases":["GHSA-9mcr-873m-xcxp","RUSTSEC-2023-0065"],"title":"Tungstenite allows remote attackers to cause a denial of service","summary":"Tungstenite allows remote attackers to cause a denial of service","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"tungstenite","product":"tungstenite","ecosystem":"rust","affected":["tungstenite < 0.20.1"],"patched":["tungstenite 0.20.1"],"published":"2023-09-21","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-9mcr-873m-xcxp","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43669"},{"url":"https://github.com/snapview/tungstenite-rs/issues/376"},{"url":"https://github.com/github/advisory-database/pull/2752"},{"url":"https://github.com/snapview/tungstenite-rs/pull/379"},{"url":"https://github.com/snapview/tungstenite-rs/commit/8b3ecd3cc0008145ab4bc8d0657c39d09db8c7e2"},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-43669"},{"url":"https://rustsec.org/advisories/RUSTSEC-2023-0065.html"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TT7SF6CQ5VHAGFLWNXY64NFSW4WIWE7D"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THK6G6CD4VW6RCROWUV2C4HSINKK3XAK"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R77EUWPZVP5WSMNXUXUDNHR7G7OI5NGM"},{"url":"https://github.com/snapview/tungstenite-rs"},{"url":"https://github.com/advisories/GHSA-9mcr-873m-xcxp"},{"url":"https://cwe.mitre.org/data/definitions/407.html"},{"url":"https://crates.io/crates/tungstenite/versions"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1215563"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2240110"}],"tags":["osv","rust"],"epss":0.02057,"epssPercentile":0.80481,"ingestedAt":"2026-07-09T18:56:37.294Z","slug":"CVE-2023-43669","body":"## Overview\n\nThe Tungstenite crate through 0.20.0 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).\n\n## Affected packages\n\n- `tungstenite < 0.20.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `tungstenite 0.20.1`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}