How severe is CVE-2024-43639?

CVE-2024-43639 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-43639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-43639?

CVE-2024-43639 primarily affects Microsoft Windows Server 2012. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-43639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-43639 have an EU (EUVD) identifier?

Yes. CVE-2024-43639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-40384.

When was CVE-2024-43639 published?

CVE-2024-43639 was published on 2024-11-12 and last updated on 2026-06-17.

CVE-2024-43639

CVE-2024-43639 is a critical-severity vulnerability in Microsoft Windows Server 2012 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-197.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-40384
Weakness: CWE-197
Affected product: Microsoft Windows Server 2012
Published: 2024-11-12
Last modified: 2026-06-17

Description

Windows KDC Proxy Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2024-43639?: Windows KDC Proxy Remote Code Execution Vulnerability
How severe is CVE-2024-43639?: CVE-2024-43639 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-43639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-43639?: CVE-2024-43639 primarily affects Microsoft Windows Server 2012. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-43639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-43639 have an EU (EUVD) identifier?: Yes. CVE-2024-43639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-40384.
When was CVE-2024-43639 published?: CVE-2024-43639 was published on 2024-11-12 and last updated on 2026-06-17.

References

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

Affected products (7)

cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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