Security advisory

{
  "id": "16660811d63f14b6ddd3a90d5d40f28eec24a6b20e0e728e6a1a2d3730e71637",
  "url": "https://osv.dev/vulnerability/CVE-2020-11995",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-11995",
    "summary": "A deserialization vulnerability existed in dubbo 2.7.5 and its earlier versions, which could lead to malicious code execution. Most Dubbo users use Hessian2 as the default serialization/deserialization protool, during Hessian2 deserializing the HashMap object, some functions in the classes stored in HasMap will be executed after a series of program calls, however, those special functions may cause remote command execution. For example, the hashCode() function of the EqualsBean class in rome-1.7.0.jar will cause the remotely load malicious classes and execute malicious code by constructing a malicious request. This issue was fixed in Apache Dubbo 2.6.9 and 2.7.8.",
    "evidence": "osv:CVE-2020-11995",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-11995",
      "aliases": [
        "CVE-2020-11995",
        "GHSA-74mg-6xqx-2vrq"
      ],
      "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/apache/dubbo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "31ca18c712de2016795ba59f499f7c254f9281d5"
                },
                {
                  "last_affected": "04576ff4ffdd5872e738b4e10e3905fe513109d2"
                },
                {
                  "introduced": "22bb9cbcf75cab6445b8706574a986517855b535"
                },
                {
                  "last_affected": "5a6a069986f3627f2d50720c50024df31a3dc38a"
                },
                {
                  "introduced": "614bcebc01336ee5047a98f96b28915680c0399c"
                },
                {
                  "last_affected": "96de4d9edaa15432e1f67b2d62dab8da9bfb96a1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "last_affected": "2.5.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.6.0"
                      },
                      {
                        "last_affected": "2.6.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apache:dubbo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.7.0"
                      },
                      {
                        "last_affected": "2.7.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "dubbo-2.7.7",
            "dubbo-2.6.8",
            "dubbo-2.6.6",
            "dubbo-2.6.1",
            "dubbo-2.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-11995.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:23.142745776Z",
      "provider": "osv",
      "references": [
        "https://lists.apache.org/thread.html/r5b2df4ef479209dc4ced457b3d58a887763b60b9354c3dc148b2eb5b%40%3Cdev.dubbo.apache.org%3E"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-11995",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430841,
  "published_at": "2021-01-11T10:15:13.187+00:00"
}