{"id":"CVE-2020-17531","aliases":["GHSA-c566-2grg-mjwg"],"url":"https://o3.security/vulnerability/CVE-2020-17531","summary":"Serialization vulnerability in Apache Tapestry","details":"A Java Serialization vulnerability was found in Apache Tapestry 4. Apache Tapestry 4 will attempt to deserialize the \"sp\" parameter even before invoking the page's validate method, leading to deserialization without authentication. Apache Tapestry 4 reached end of life in 2008 and no update to address this issue will be released. Apache Tapestry 5 versions are not vulnerable to this issue. Users of Apache Tapestry 4 should upgrade to the latest Apache Tapestry 5 version.","published":"2020-12-08T13:15:13.010Z","modified":"2026-07-08T12:27:27.583568Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.09732,"percentile":0.9522,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tapestry:tapestry-project","fixedVersion":"5.0.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2022/12/02/1"},{"type":"ADVISORY","url":"https://lists.apache.org/thread.html/r700a6aa234dbff0555d4187bdc8274d7e4c0afbf35b9a3457f09ee76%40%3Cusers.tapestry.apache.org%3E"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210115-0007/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T12:27:27.583568Z"}}