{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.0.3"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4bd71941974a1b077e955616d7ba3da6fd21670c"
            },
            {
              "fixed": "d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66"
            }
          ],
          "repo": "https://github.com/theonedev/onedev",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is an issue involving YAML parsing which can lead to post-auth remote code execution. In order to parse and process YAML files, OneDev uses SnakeYaml which by default (when not using `SafeConstructor`) allows the instantiation of arbitrary classes. We can leverage that to run arbitrary code by instantiating classes such as `javax.script.ScriptEngineManager` and using `URLClassLoader` to load the script engine provider, resulting in the instantiation of a user controlled class. For a full example refer to the referenced GHSA. This issue was addressed in 4.0.3 by only allowing certain known classes to be deserialized",
  "id": "CVE-2021-21249",
  "modified": "2026-03-13T21:57:37.712448889Z",
  "published": "2021-01-15T21:15:13.740Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpm"
    },
    {
      "type": "FIX",
      "url": "https://github.com/theonedev/onedev/commit/d6fc4212b1ac1e9bbe3ce444e95f9af1e3ab8b66"
    }
  ],
  "related": [
    "GHSA-7xhq-m2q9-6hpm"
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}