CVE-2020-6016
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.00%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 6.00% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-590, CWE-787
- Affected
- valvesoftware/game networking sockets
- Source
- cve@checkpoint.com
EPSS 6.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43Patch, Third Party Advisory
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/Exploit, Third Party Advisory
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43Patch, Third Party Advisory
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.