CVE-2025-27478

HIGH

Published Apr 8, 2025 Modified Jul 8, 2025 CWE-122

Description

Heap-based buffer overflow in Windows Local Security Authority (LSA) allows an authorized attacker to elevate privileges locally.

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CVSS v3.1 Score

7.0

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
microsoft	windows_10_1507	< 10.0.10240.20978
microsoft	windows_10_1507	< 10.0.10240.20978
microsoft	windows_10_1607	< 10.0.14393.7969
microsoft	windows_10_1607	< 10.0.14393.7969
microsoft	windows_10_1809	< 10.0.17763.7136
microsoft	windows_10_1809	< 10.0.17763.7136
microsoft	windows_10_21h2	< 10.0.19044.5737
microsoft	windows_10_22h2	< 10.0.19045.5737
microsoft	windows_11_22h2	< 10.0.22621.5189
microsoft	windows_11_23h2	< 10.0.22631.5189
microsoft	windows_11_24h2	< 10.0.26100.3775
microsoft	windows_server_2008	All
microsoft	windows_server_2008	All
microsoft	windows_server_2008	All
microsoft	windows_server_2012	All
microsoft	windows_server_2012	All
microsoft	windows_server_2016	< 10.0.14393.7969
microsoft	windows_server_2019	< 10.0.17763.7136
microsoft	windows_server_2022	< 10.0.20348.3453
microsoft	windows_server_2022_23h2	< 10.0.25398.1551
microsoft	windows_server_2025	< 10.0.26100.3775

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27478

Frequently Asked Questions

What is CVE-2025-27478? +

Heap-based buffer overflow in Windows Local Security Authority (LSA) allows an authorized attacker to elevate privileges locally. It has a CVSS v3.1 base score of 7.0 (HIGH).

How severe is CVE-2025-27478? +

CVE-2025-27478 has a CVSS v3.1 score of 7.0 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-27478? +

CVE-2025-27478 affects products from microsoft, specifically: windows_10_1507, windows_10_1607, windows_10_1809, windows_10_21h2, windows_10_22h2, windows_11_22h2, windows_11_23h2, windows_11_24h2, windows_server_2008, windows_server_2012, windows_server_2016, windows_server_2019, windows_server_2022, windows_server_2022_23h2, windows_server_2025. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27478? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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