What’s Vulnerable › Vulnerabilities

CVE-2020-6018

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-02 · updated 2026-06-17
• Weakness: CWE-120

Description

Valve's Game Networking Sockets prior to version v1.2.0 improperly handles long encrypted messages in function AES_GCM_DecryptContext::Decrypt() when compiled using libsodium, leading to a Stack-Based Buffer Overflow and resulting in a memory corruption and possibly even a remote code execution.

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/bea84e2844b647532a9b7fbc3a6a8989d66e49e3
• https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
• https://github.com/ValveSoftware/GameNetworkingSockets/commit/bea84e2844b647532a9b7fbc3a6a8989d66e49e3
• https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/

Get alerted when CVE-2020-6018 or the next vulnerability affects your stack