{"id":"GHSA-6q5m-22mq-q2xv","summary":"Istio Authorization Bypass Vulnerability","details":"Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.","aliases":["CVE-2021-31920"],"modified":"2026-09-10T03:49:38.068368427Z","published":"2022-05-24T19:03:32Z","withdrawn":"2023-08-07T20:57:01Z","database_specific":{"github_reviewed_at":"2023-07-11T16:53:41Z","nvd_published_at":"2021-05-27T05:15:00Z","cwe_ids":["CWE-863"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31920"},{"type":"WEB","url":"https://istio.io/latest/news/security/istio-security-2021-005"}],"affected":[{"package":{"name":"istio.io/istio","ecosystem":"Go","purl":"pkg:golang/istio.io/istio"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-6q5m-22mq-q2xv/GHSA-6q5m-22mq-q2xv.json"}},{"package":{"name":"istio.io/istio","ecosystem":"Go","purl":"pkg:golang/istio.io/istio"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.9.0"},{"fixed":"1.9.5"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.9.4","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-6q5m-22mq-q2xv/GHSA-6q5m-22mq-q2xv.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}