{"id":"CVE-2020-16844","aliases":["GHSA-82mm-ffjr-h86c"],"url":"https://o3.security/vulnerability/CVE-2020-16844","summary":"Authorization bypass in Istio","details":"In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.\n\n### Specific Go Packages Affected\nistio.io/istio/pilot/pkg/security/authz/model/matcher","published":"2020-10-01T17:15:13.150Z","modified":"2026-07-08T11:48:19.594597Z","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"},"epss":{"score":0.011,"percentile":0.62661,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Go","name":"istio.io/istio","fixedVersion":"1.5.9"},{"ecosystem":"Go","name":"istio.io/istio","fixedVersion":"1.6.8"}],"fix":{"url":"https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c","label":"istio/istio@4c73414"},"references":[{"type":"ADVISORY","url":"https://github.com/istio/istio/releases"},{"type":"EVIDENCE","url":"https://istio.io/latest/news/security/istio-security-2020-009/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-16844"},{"type":"WEB","url":"https://github.com/istio/istio/commit/4c73414556b83f0e75c1b3a0a89a23103a71573c"},{"type":"WEB","url":"https://github.com/istio/istio/commit/72d2e135374f421b656d6f1a21f474db46134ace"},{"type":"WEB","url":"https://github.com/istio/istio/releases/tag/1.5.9"},{"type":"WEB","url":"https://github.com/istio/istio/releases/tag/1.6.8"},{"type":"WEB","url":"https://istio.io/latest/news/releases/1.5.x/announcing-1.5.9"},{"type":"WEB","url":"https://istio.io/latest/news/releases/1.6.x/announcing-1.6.8"},{"type":"WEB","url":"https://istio.io/latest/news/security/istio-security-2020-009"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T11:48:19.594597Z"}}