{"id":"CVE-2020-11995","aliases":["EUVD-2022-0880","GHSA-74mg-6xqx-2vrq"],"status":"published","title":"Apache Dubbo default deserialization protocol Hessian2 cause CRE","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.05926,"percentile":0.93304,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-502"],"published":"2021-01-11T09:40:19Z","modified":"2026-10-24T10:30:23Z","fixes":[{"ecosystem":"Maven","package":"org.apache.dubbo:dubbo-parent","fixed_in":["2.7.8","2.6.9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.dubbo:dubbo-parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.7.0"},{"fixed":"2.7.8"}]}]},{"source":"ghsa","ecosystem":"Maven","package":"org.apache.dubbo:dubbo-parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.9"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.apache.dubbo:dubbo-parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.7.0"},{"fixed":"2.7.8"}]}],"versions":["2.7.0","2.7.1","2.7.2","2.7.3","2.7.4","2.7.4.1","2.7.5","2.7.6","2.7.7"]},{"source":"osv","ecosystem":"Maven","package":"org.apache.dubbo:dubbo-parent","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.9"}]}]}],"products":[{"vendor":"apache","product":"dubbo"},{"vendor":"apache software foundation","product":"apache dubbo"}],"references":[{"url":"https://lists.apache.org/thread.html/r5b2df4ef479209dc4ced457b3d58a887763b60b9354c3dc148b2eb5b%40%3Cdev.dubbo.apache.org%3E","tags":["x_refsource_MISC","x_transferred","Mailing List","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11995","tags":["advisory"]},{"url":"https://github.com/apache/dubbo/commit/d2e9baf380108950c48e0ab700ccdbf11dd753ab","tags":["web"]},{"url":"https://github.com/advisories/GHSA-74mg-6xqx-2vrq"}],"sources":{"cve":[{"id":"CVE-2020-11995","title":"Apache Dubbo default deserialization protocol Hessian2 cause CRE","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.","status":"published","published":"2021-01-11T09:40:19Z","modified":"2025-02-13T16:27:27.063Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:35:57.67317Z"}],"euvd":[{"id":"EUVD-2022-0880","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.","status":"published","published":"2021-01-11T09:40:19Z","modified":"2025-02-13T16:27:27Z","cvss":[{"version":"","score":0,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"none"}],"updated_at":"2026-11-03T00:03:53.290549Z"}],"ghsa":[{"id":"GHSA-74mg-6xqx-2vrq","title":"Deserialization exploitation in Apache Dubbo","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 HashMap 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.","status":"published","published":"2022-02-09T22:27:01Z","modified":"2023-02-01T05:05:19Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:36:33.613868Z"}],"nvd":[{"id":"CVE-2020-11995","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.","status":"published","published":"2021-01-11T10:15:13.187Z","modified":"2026-06-17T02:51:13.017Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:06:28.892872Z"}],"osv":[{"id":"CVE-2020-11995","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.","status":"published","published":"2021-01-11T10:15:13.187Z","modified":"2026-10-24T10:30:23.142745776Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:14.034736Z"},{"id":"GHSA-74mg-6xqx-2vrq","title":"Deserialization exploitation in Apache Dubbo","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 HashMap 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.","status":"published","published":"2022-02-09T22:27:01Z","modified":"2023-11-08T04:02:09.09819Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:40.657155Z"}]}}