{"cve":"CVE-2020-11995","nvd":{"published":"2021-01-11T10:15:13.187","modified":"2026-06-17T02:51:13.017","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-502"],"references":["https://lists.apache.org/thread.html/r5b2df4ef479209dc4ced457b3d58a887763b60b9354c3dc148b2eb5b%40%3Cdev.dubbo.apache.org%3E","https://lists.apache.org/thread.html/r5b2df4ef479209dc4ced457b3d58a887763b60b9354c3dc148b2eb5b%40%3Cdev.dubbo.apache.org%3E"],"products":["apache:dubbo"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-11995","score":0.05926,"percentile":0.93251,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-74mg-6xqx-2vrq","url":"https://osv.dev/vulnerability/GHSA-74mg-6xqx-2vrq","summary":"Deserialization exploitation in Apache Dubbo","modified":"2023-11-08T04:02:09.098190Z","packages":[{"ecosystem":"Maven","name":"org.apache.dubbo:dubbo-parent","purl":"pkg:maven/org.apache.dubbo/dubbo-parent","ranges":[">=2.7.0 <2.7.8"],"fixed":["2.7.8"]},{"ecosystem":"Maven","name":"org.apache.dubbo:dubbo-parent","purl":"pkg:maven/org.apache.dubbo/dubbo-parent","ranges":["<2.6.9"],"fixed":["2.6.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}