{"id":"CVE-2020-8843","aliases":["EUVD-2020-29685","GHSA-8hpm-7f4v-97xg"],"status":"published","title":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible...","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01065,"percentile":0.6497,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-02-14T18:45:19Z","modified":"2026-10-20T10:54:25Z","products":[{"vendor":"istio","product":"istio"}],"references":[{"url":"https://github.com/istio/istio/commits/master","tags":["x_refsource_MISC","x_transferred","Patch","fix"]},{"url":"https://istio.io/news/security/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://istio.io/news/security/istio-security-2020-002/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8843"},{"url":"https://github.com/advisories/GHSA-8hpm-7f4v-97xg"}],"sources":{"cve":[{"id":"CVE-2020-8843","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","status":"published","published":"2020-02-14T18:45:19Z","modified":"2024-08-04T10:12:10.957Z","updated_at":"2026-11-02T14:35:51.206854Z"}],"euvd":[{"id":"EUVD-2020-29685","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","status":"published","published":"2020-02-14T18:45:19Z","modified":"2024-08-04T10:12:10Z","updated_at":"2026-11-03T03:07:56.155078Z"}],"ghsa":[{"id":"GHSA-8hpm-7f4v-97xg","title":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible...","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","status":"published","published":"2022-05-24T17:09:04Z","modified":"2023-01-29T05:01:43Z","updated_at":"2026-11-02T14:44:53.556707Z"}],"nvd":[{"id":"CVE-2020-8843","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","status":"published","published":"2020-02-14T19:15:10.683Z","modified":"2026-06-17T03:27:02.97Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:05:54.796125Z"}],"osv":[{"id":"CVE-2020-8843","description":"An issue was discovered in Istio 1.3 through 1.3.6. Under certain circumstances, it is possible to bypass a specifically configured Mixer policy. Istio-proxy accepts the x-istio-attributes header at ingress that can be used to affect policy decisions when Mixer policy selectively applies to a source equal to ingress. To exploit this vulnerability, someone has to encode a source.uid in this header. This feature is disabled by default in Istio 1.3 and 1.4.","status":"published","published":"2020-02-14T19:15:10.683Z","modified":"2026-10-20T10:54:25.749785819Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"}]}}