#VU49489 Input validation error in Microsoft SQL Server - CVE-2021-1636
Published: January 12, 2021 / Updated: January 12, 2021
Vulnerability identifier: #VU49489
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-1636
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Microsoft SQL Server
Microsoft SQL Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input, when the affected SQL Server is configured to run an Extended Event session. A remote user can send specially crafted data to the server and execute arbitrary code with elevated privileges.
Remediation
Install updates from vendor's website.