{"cve":"CVE-2020-16844","nvd":{"published":"2020-10-01T17:15:13.150","modified":"2026-06-17T02:58:07.657","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","score":6.8},"cwes":[],"references":["https://github.com/istio/istio/releases","https://istio.io/latest/news/security/istio-security-2020-009/","https://github.com/istio/istio/releases","https://istio.io/latest/news/security/istio-security-2020-009/"],"products":["istio:istio"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2020-16844","score":0.01095,"percentile":0.65539,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-82mm-ffjr-h86c","url":"https://osv.dev/vulnerability/GHSA-82mm-ffjr-h86c","summary":"Authorization bypass in Istio","modified":"2023-11-08T04:02:39.497559Z","packages":[{"ecosystem":"Go","name":"istio.io/istio","purl":"pkg:golang/istio.io/istio","ranges":[">=1.5.0 <1.5.9"],"fixed":["1.5.9"]},{"ecosystem":"Go","name":"istio.io/istio","purl":"pkg:golang/istio.io/istio","ranges":[">=1.6.0 <1.6.8"],"fixed":["1.6.8"]}]}],"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."]}