Security advisory

{
  "id": "e2836b732aa81a51a2904e63a8f2522d56ac170457a91ee6fb5e219c035fae10",
  "url": "https://osv.dev/vulnerability/CVE-2021-29441",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-29441",
    "summary": "Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.",
    "evidence": "osv:CVE-2021-29441",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-29441",
      "aliases": [
        "CVE-2021-29441",
        "CVE-2021-29442",
        "GHSA-36hp-jr8h-556f",
        "GHSA-xv5h-v7jh-p2qh"
      ],
      "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/alibaba/nacos",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1d88d5d773c46912957a15cb6e78bd8b01c89fde"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.3.2",
            "1.3.1",
            "1.3.0-beta",
            "1.0.1",
            "1.0.0",
            "1.0.0-RC3",
            "1.0.0-RC2",
            "1.0.0-RC1",
            "0.7.0",
            "0.3.0",
            "0.3.0-RC1",
            "0.2.1",
            "0.2.1-RC1",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29441.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:37.116754468Z",
      "provider": "osv",
      "references": [
        "https://github.com/alibaba/nacos/pull/4703",
        "https://github.com/advisories/GHSA-36hp-jr8h-556f",
        "https://github.com/alibaba/nacos/issues/4701"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-29441",
        "evidence": "/id"
      },
      {
        "value": "CVE-2021-29442",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385748,
  "published_at": "2021-04-27T21:15:07.993+00:00"
}