CVE-2020-6016
highpriority · track · 41EPSS 0.060 · 93 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 9–10
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
- valvesoftware game networking sockets< 1.2.0nvdUScpe:2.3:a:valvesoftware:game_networking_sockets:*:*:*:*:*:*:*:*
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-6016cnnvd
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/cnnvd
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43enisa_euvd
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/enisa_euvd
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43PatchThird Party Advisorynvd
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/ExploitThird Party Advisorynvd
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