CVE-2025-54899

HIGH

Published Sep 9, 2025 Modified Sep 12, 2025 CWE-590

Description

Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-590 CWE-590

Affected Products

Vendor	Product	Versions
microsoft	365_apps	All
microsoft	365_apps	All
microsoft	excel	All
microsoft	excel	All
microsoft	office	All
microsoft	office	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All
microsoft	office_long_term_servicing_channel	All

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54899

Frequently Asked Questions

What is CVE-2025-54899? +

Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code locally. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-54899? +

CVE-2025-54899 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-54899? +

CVE-2025-54899 affects products from microsoft, specifically: 365_apps, excel, office, office_long_term_servicing_channel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-54899? +

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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