Out-of-bounds write in Game Networking Sockets
Priority MEDIUM 51CWE-590Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.06 93rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Game Networking Sockets: v1.2.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Game Networking Sockets | before v1.2.0 | v1.2.0 | Patch available | CNA |
- Game Networking Sockets Vendor— Affected before v1.2.0 Fixed in v1.2.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:valvesoftware:game_networking_sockets:*:*:*:*:*:*:*:* | before 1.2.0 | Vulnerable | Valvesoftware |
- cpe:2.3:a:valvesoftware:game_networking_sockets:*:*:*:*:*:*:*:* Versions before 1.2.0 Vulnerable ·Valvesoftware
Remediation
- Fix · CNA Game Networking Sockets Fixed in v1.2.0
Timeline
- 2026-10-02 Threatist record created from CVE-2020-6016
- 2026-10-03 Alias added: GHSA-2rgm-7354-cfw6
References
More Valvesoftware Game Networking Sockets vulnerabilities
- TI-2020-04918 Buffer overflow in Game Networking Sockets CVSS 3.1CRITICAL 9.8
- TI-2020-04917 Buffer overflow in Game Networking Sockets CVSS 3.1CRITICAL 9.8
- TI-2020-04919 Valve's Game Networking Sockets prior to version v1.2.0 improperly handles inlined… CVSS 3.1HIGH 7.5
Sources
- CVE-2020-6016 · CVE Program
- CVE-2020-6016 · NVD
- FIRST EPSS
- GHSA-2rgm-7354-cfw6 · GitHub Advisory Database · CC BY 4.0
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