Vulnerability identifier: #VU71037

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-21535

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to a race condition in Windows Secure Socket Tunneling Protocol (SSTP). A local user can exploit the race and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 - 10 S, 11 - 11 22H2, 8.1 - 8.1 RT

Windows Server: 2008 - 2022

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21535

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.