Valve's Game Networking Sockets prior to version v1.2.0 improperly handles long unreliable segments in function…

Description

Valve's Game Networking Sockets prior to version v1.2.0 improperly handles long unreliable segments in function SNP_ReceiveUnreliableSegment() when configured to support plain-text messages, leading to a Heap-Based Buffer Overflow and resulting in a memory corruption and possibly even a remote code execution.

Scores

EPSS (exploitation in 30 days)

3.2% · top 12% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

• CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (opens in a new tab)All about CWE-120 and its CVEs
• CWE-787 (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• Game Networking Sockets

  • affected All versions prior to v1.2.0

References (2)

• https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43 (opens in a new tab)x_refsource_MISCx_transferred
• https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/ (opens in a new tab)x_refsource_MISCx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2020-6017](https://trackcve.app/badge/CVE-2020-6017.svg)](https://trackcve.app/cve/CVE-2020-6017)

Record last updated 4 Aug 2024, 08:47 UTC.