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.
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
Exploit, Third Party Advisory x_refsource_misc
https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
Scores
CVSS v3
9.8
EPSS
0.0663
EPSS Percentile
91.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-590
CWE-787
Status
published
Products (1)
valvesoftware/game_networking_sockets
< 1.2.0
Published
Nov 18, 2020
Tracked Since
Feb 18, 2026