Security advisory

{
  "id": "3217fae012ccc36835b5350f4008fde76423623674e32c2c689813a59959c00e",
  "url": "https://osv.dev/vulnerability/CVE-2021-21335",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21335",
    "summary": "In the SPNEGO HTTP Authentication Module for nginx (spnego-http-auth-nginx-module) before version 1.1.1 basic Authentication can be bypassed using a malformed username. This affects users of spnego-http-auth-nginx-module that have enabled basic authentication. This is fixed in version 1.1.1 of spnego-http-auth-nginx-module. As a workaround, one may disable basic authentication.",
    "evidence": "osv:CVE-2021-21335",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-21335",
      "aliases": [
        "CVE-2021-21335",
        "GHSA-ww8q-72rx-hc54"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/stnoonan/spnego-http-auth-nginx-module",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a06f9efca373e25328b1c53639a48decd0854570"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:spnego_http_authentication_module_project:spnego_http_authentication_module:*:*:*:*:*:nginx:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a06f9efca373e25328b1c53639a48decd0854570"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a06f9efca373e25328b1c53639a48decd0854570"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.1.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21335.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-21335-96db8614",
                "digest": {
                  "length": 3010,
                  "function_hash": "72009278362700319588796017657292650017"
                },
                "source": "https://github.com/stnoonan/spnego-http-auth-nginx-module/commit/a06f9efca373e25328b1c53639a48decd0854570",
                "target": {
                  "file": "ngx_http_auth_spnego_module.c",
                  "function": "ngx_http_auth_spnego_handler"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-21335-e3d42e4c",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "184303827427714694529644895348184658594",
                    "339901842394811731769551324700142596822",
                    "77201998263918464123882835720729499067",
                    "319109234672289250995724412850191116713"
                  ]
                },
                "source": "https://github.com/stnoonan/spnego-http-auth-nginx-module/commit/a06f9efca373e25328b1c53639a48decd0854570",
                "target": {
                  "file": "ngx_http_auth_spnego_module.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:02:35Z"
          }
        }
      ],
      "modified": "2026-10-20T14:02:35.404965760Z",
      "provider": "osv",
      "references": [
        "https://github.com/stnoonan/spnego-http-auth-nginx-module/releases/tag/v1.1.1",
        "https://github.com/stnoonan/spnego-http-auth-nginx-module/commit/a06f9efca373e25328b1c53639a48decd0854570",
        "https://github.com/stnoonan/spnego-http-auth-nginx-module/security/advisories/GHSA-ww8q-72rx-hc54"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21335",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388517,
  "published_at": "2021-03-08T21:15:16.573+00:00"
}