How severe is CVE-2025-27739?

CVE-2025-27739 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-27739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27739?

CVE-2025-27739 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-27739?

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

Does CVE-2025-27739 have an EU (EUVD) identifier?

Yes. CVE-2025-27739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10145.

When was CVE-2025-27739 published?

CVE-2025-27739 was published on 2025-04-08 and last updated on 2026-06-17.

CVE-2025-27739

CVE-2025-27739 is a high-severity vulnerability in Microsoft Windows 10 1809 with a CVSS 3.x base score of 7.8. 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-822.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-10145
Weakness: CWE-822
Affected product: Microsoft Windows 10 1809
Published: 2025-04-08
Last modified: 2026-06-17

Description

Untrusted pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2025-27739?: Untrusted pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges locally.
How severe is CVE-2025-27739?: CVE-2025-27739 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-27739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27739?: CVE-2025-27739 primarily affects Microsoft Windows 10 1809. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-27739?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-27739 have an EU (EUVD) identifier?: Yes. CVE-2025-27739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10145.
When was CVE-2025-27739 published?: CVE-2025-27739 was published on 2025-04-08 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27739

Affected products (11)

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
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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