Security advisory

{
  "id": "2c7b44a7b0542feb3be748b0f45728c888e64db8b063e757904776c1cd703b5a",
  "url": "https://osv.dev/vulnerability/CVE-2021-43557",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43557",
    "summary": "The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains \"^/internal/\", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.",
    "evidence": "osv:CVE-2021-43557",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-43557",
      "aliases": [
        "BIT-apisix-2021-43557",
        "CVE-2021-43557"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/apisix",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "19587ed9f71dd20c5e8dbdc2f79c8f96296e73e3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.10.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.10.1",
            "2.10.0",
            "v0.9",
            "0.9-RC1",
            "v0.7",
            "v0.5",
            "v0.4.1",
            "v0.4",
            "v0.3-1",
            "v0.3",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43557.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:23.075735829Z",
      "provider": "osv",
      "references": [
        "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-43557",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430823,
  "published_at": "2021-11-22T09:15:07.627+00:00"
}