{"id":"CVE-2020-6016","details":"Valve's Game Networking Sockets prior to version v1.2.0 improperly handles unreliable segments with negative offsets in function SNP_ReceiveUnreliableSegment(), leading to a Heap-Based Buffer Underflow and a free() of memory not from the heap, resulting in a memory corruption and probably even a remote code execution.","modified":"2026-03-02T08:00:12.461737Z","published":"2020-11-18T15:15:13.193Z","references":[{"type":"ADVISORY","url":"https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43"},{"type":"ADVISORY","url":"https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/"},{"type":"FIX","url":"https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43"},{"type":"EVIDENCE","url":"https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/valvesoftware/gamenetworkingsockets","events":[{"introduced":"0"},{"fixed":"5fe10494e27be722d18c443dc70f851541e5d554"}]}],"versions":["1.0.0","v1.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-6016.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}