{"id":"CVE-2020-6016","aliases":["EUVD-2020-27170","GHSA-2rgm-7354-cfw6"],"status":"published","title":"Valve's Game Networking Sockets prior to version v1.2.0 improperly handles unreliable segments...","description":"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.","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":0.06,"percentile":0.93377,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-590","CWE-787"],"published":"2020-11-18T14:11:49Z","modified":"2026-10-20T14:14:34Z","products":[{"vendor":"valvesoftware","product":"game_networking_sockets"}],"references":[{"url":"https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-6016"},{"url":"https://github.com/advisories/GHSA-2rgm-7354-cfw6"}],"sources":{"cve":[{"id":"CVE-2020-6016","description":"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.","status":"published","published":"2020-11-18T14:11:49Z","modified":"2024-08-04T08:47:41.048Z","cwes":["CWE-590"],"updated_at":"2026-11-02T14:35:52.268457Z"}],"euvd":[{"id":"EUVD-2020-27170","description":"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.","status":"published","published":"2020-11-18T14:11:49Z","modified":"2024-08-04T08:47:41Z","updated_at":"2026-11-03T03:08:04.689205Z"}],"ghsa":[{"id":"GHSA-2rgm-7354-cfw6","title":"Valve's Game Networking Sockets prior to version v1.2.0 improperly handles unreliable segments...","description":"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.","status":"published","published":"2022-05-24T17:34:36Z","modified":"2023-01-27T05:02:15Z","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-787"],"updated_at":"2026-11-02T14:42:02.546908Z"}],"nvd":[{"id":"CVE-2020-6016","description":"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.","status":"published","published":"2020-11-18T15:15:13.193Z","modified":"2026-06-17T03:22:35.753Z","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":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-590","CWE-787"],"updated_at":"2026-11-02T14:06:25.394006Z"}],"osv":[{"id":"CVE-2020-6016","description":"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.","status":"published","published":"2020-11-18T15:15:13.193Z","modified":"2026-10-20T14:14:34.85263457Z","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":"2026-11-02T15:44:16.936975Z"}]}}