CVE-2020-6016
9.8
CRITICAL · CVSS 3.1 · EPSS 6% (pctl 93)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 6% — more likely to be exploited than 93% of all CVEs |
| Weakness | CWE-590 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-11-18 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| valvesoftware | game networking sockets |
References
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
→ the Explorer · watch your stack · NVD