What’s Vulnerable › Vulnerabilities

CVE-2020-6019

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-13 · updated 2026-06-17
• Weakness: CWE-248

Description

Valve's Game Networking Sockets prior to version v1.2.0 improperly handles inlined statistics messages in function CConnectionTransportUDPBase::Received_Data(), leading to an exception thrown from libprotobuf and resulting in a crash.

Affected products

• Game Networking Sockets: before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: Game Networking Sockets 1.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/ValveSoftware/GameNetworkingSockets/commit/d944a10808891d202bb1d5e1998de6e0423af678
• https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
• https://github.com/ValveSoftware/GameNetworkingSockets/commit/d944a10808891d202bb1d5e1998de6e0423af678
• https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/

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