#VU100409 Numeric Truncation Error in Windows Server - CVE-2024-43639

Vulnerability identifier: #VU100409

Vulnerability risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: CVE-2024-43639

CWE-ID: CWE-197

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to numeric truncation error in Windows Kerberos. A remote attacker can use a specially crafted application and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows Server: before 2012 R2, 2012, 2016, 2019, 2022 23H2, 2022, 2025, 2012 R2, 2012 R2, 2012 R2, 2012 R2, 2012 R2

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External links
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43639

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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.