Security advisory

{
  "id": "7d22161c70cbe22ad0e78a855905936ee2ae7fdc32b331a4544bae6b9757063f",
  "url": "https://osv.dev/vulnerability/CVE-2021-28156",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-28156",
    "summary": "HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events. Fixed in 1.9.5, and 1.8.10.",
    "evidence": "osv:CVE-2021-28156",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-28156",
      "aliases": [
        "BIT-consul-2021-28156",
        "CVE-2021-28156"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hashicorp/consul",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3111cb8c7df8545abaa0c96347996b5341ff625d"
                },
                {
                  "fixed": "46a6ae729e8dda3f814820885d463e76bfdbc7b8"
                },
                {
                  "introduced": "a417fe51040a33039d3282e31c6c6b6f4fd1f886"
                },
                {
                  "fixed": "3c1c22679e9ca097211b3b6602da2e95a5d4401b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "1.8.0"
                      },
                      {
                        "fixed": "1.8.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "1.9.0"
                      },
                      {
                        "fixed": "1.9.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28156.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:05.383425650Z",
      "provider": "osv",
      "references": [
        "https://discuss.hashicorp.com/t/hcsec-2021-08-consul-enterprise-audit-log-bypass-for-http-events/23369",
        "https://security.gentoo.org/glsa/202208-09",
        "https://www.hashicorp.com/blog/category/consul"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-28156",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440742,
  "published_at": "2021-04-20T16:15:10.407+00:00"
}