{"id":"CVE-2020-15117","aliases":["EUVD-2020-7223","GHSA-chfm-333q-gfpp","MGASA-2021-0040","UBUNTU-CVE-2020-15117"],"status":"published","title":"Denial of Service in Synergy","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02494,"percentile":0.84805,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-754","CWE-755"],"published":"2020-07-15T17:25:14Z","modified":"2026-10-17T02:45:28Z","fixes":[{"ecosystem":"Mageia:7","package":"synergy","fixed_in":["1.12.0-1.mga7"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Mageia:7","package":"synergy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.0-1.mga7"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"synergy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2-0ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"synergy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.8-stable+dfsg.1-1","1.8.8-stable+dfsg.1-1build1"]}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"symless","product":"synergy"},{"vendor":"symless","product":"synergy-core"}],"references":[{"url":"https://github.com/symless/synergy-core/security/advisories/GHSA-chfm-333q-gfpp","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://github.com/symless/synergy-core/commit/0a97c2be0da2d0df25cb86dfd642429e7a8bea39","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VFDEQED64YLWQK2TF73EMXZDYX7YT2DD/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAQYCMBWNVCIEM27NPIKK3DGJCNBYLAK/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://advisories.mageia.org/MGASA-2021-0040.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=27851","tags":["report"]},{"url":"https://github.com/symless/synergy-core/releases/tag/1.11.0-stable","tags":["web"]},{"url":"https://github.com/symless/synergy-core/releases/tag/v1.11.1-stable","tags":["web"]},{"url":"https://github.com/symless/synergy-core/releases/tag/v1.12.0-stable","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/VFDEQED64YLWQK2TF73EMXZDYX7YT2DD/","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2020-15117","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-15117","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-15117","title":"Denial of Service in Synergy","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","status":"published","published":"2020-07-15T17:25:14Z","modified":"2024-08-04T13:08:21.956Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:35:49.879248Z"}],"euvd":[{"id":"EUVD-2020-7223","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","status":"published","published":"2020-07-15T17:25:14Z","modified":"2024-08-04T13:08:21Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T03:07:33.100327Z"}],"nvd":[{"id":"CVE-2020-15117","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","status":"published","published":"2020-07-15T18:15:36.333Z","modified":"2026-06-17T02:56:05.11Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-755","CWE-754"],"updated_at":"2026-11-02T14:06:10.086163Z"}],"osv":[{"id":"CVE-2020-15117","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","status":"published","published":"2020-07-15T18:15:36.333Z","modified":"2026-10-17T02:45:28.921544307Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:14.418339Z"},{"id":"UBUNTU-CVE-2020-15117","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving a kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295) if the servers memory is less than 4 GB. It was verified that this issue does not cause a crash through the exception handler if the available memory of the Server is more than 4GB.","status":"published","published":"2020-07-15T18:15:00Z","modified":"2025-10-24T04:48:35Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:23.344108Z"},{"id":"MGASA-2021-0040","title":"Updated synergy packages fix a security vulnerability","description":"In Synergy before version 1.12.0, a Synergy server can be crashed by receiving\na kMsgHelloBack packet with a client name length set to 0xffffffff (4294967295)\nif the servers memory is less than 4 GB. It was verified that this issue does\nnot cause a crash through the exception handler if the available memory of the\nServer is more than 4GB (CVE-2020-15117).\n\nThe synergy package has been updated to version 1.12.0, fixing this issue and\nseveral other bugs.\n","status":"published","published":"2021-01-17T16:07:01Z","modified":"2026-04-16T04:44:08.658747955Z","updated_at":"2026-11-02T15:49:41.509337Z"}]}}