{"cve":"CVE-2023-6193","nvd":{"published":"2023-12-12T14:15:07.797","modified":"2026-06-17T06:50:16.490","status":"Modified","description":"quiche v. 0.15.0 through 0.19.0 was discovered to be vulnerable to unbounded queuing of path validation messages, which could lead to excessive resource consumption.\nQUIC path validation (RFC 9000 Section 8.2) requires that the recipient of a PATH_CHALLENGE frame responds by sending a PATH_RESPONSE. An unauthenticated remote attacker can exploit the vulnerability by sending PATH_CHALLENGE frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that PATH_RESPONSE frames can only be sent at the slower rate than they are received; leading to storage of path validation data in an unbounded queue. \nQuiche versions greater than 0.19.0 address this problem.","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:L","score":5.3},"cwes":["CWE-400"],"references":["https://datatracker.ietf.org/doc/html/rfc9000#section-8.2","https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm","https://datatracker.ietf.org/doc/html/rfc9000#section-8.2","https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm"],"products":["cloudflare:quiche"],"source":"nvd","synced_at":"2026-10-19T21:42:34.585441961+00:00"},"epss":{"cve":"CVE-2023-6193","score":0.00763,"percentile":0.55409,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w3vp-jw9m-f9pm","url":"https://osv.dev/vulnerability/GHSA-w3vp-jw9m-f9pm","summary":"Unbounded queuing of path validation messages in cloudflare-quiche","modified":"2026-07-08T06:53:09.204971916Z","packages":[{"ecosystem":"crates.io","name":"quiche","purl":"pkg:cargo/quiche","ranges":[">=0.15.0 <0.19.1"],"fixed":["0.19.1"]}]}],"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."]}