CRITICAL

CVE-2020-6016

CVSS v3

9.8

CRITICAL

EPSS Score

6.0 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2020-6016 yet.

Full record on NVD

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.

Technical details

Published: 2020-11-18

Frequently asked questions

What is CVE-2020-6016?

Is CVE-2020-6016 actively exploited?

Active exploitation of CVE-2020-6016 has not been confirmed. Its EPSS score was 6.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-6016?

CVE-2020-6016 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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