Stack-based buffer overflow in Game Networking Sockets - CVE-2020-6018
Published: November 18, 2020 / Updated: December 11, 2020
Vulnerability identifier: #VU48928
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2020-6018
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Valve Software
Affected software:
Game Networking Sockets
Game Networking Sockets
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing long encrypted messages within the AES_GCM_DecryptContext::Decrypt() function. A remote unauthenticated attacker can send specially crafted messages to the application, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2020-6018
Install updates from vendor's website.