Security advisory

{
  "id": "b286c94a4276412d0acb2a7aafb80d1b61e33953a77c045da426cc19deb7d907",
  "url": "https://osv.dev/vulnerability/CVE-2020-8843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8843",
    "summary": "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.",
    "evidence": "osv:CVE-2020-8843",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-8843",
      "aliases": [
        "CVE-2020-8843"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/istio/istio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "c2bd59595ce699b31d0f931885f023028ff7902b"
                },
                {
                  "last_affected": "48148f5be3c6d84fe1fce8a0491d3c89593145a2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "last_affected": "1.3.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.6",
            "1.3.5",
            "1.3.4",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8843.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:25.749785819Z",
      "provider": "osv",
      "references": [
        "https://istio.io/news/security/",
        "https://istio.io/news/security/istio-security-2020-002/",
        "https://github.com/istio/istio/commits/master"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385350,
  "published_at": "2020-02-14T19:15:10.683+00:00"
}