Cyber Resilience

CVE-2025-54899

High

Published: 09 September 2025

Published
09 September 2025
Modified
12 September 2025
KEV Added
—
Patch
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CVSS Score v3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0027 50.9th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-54899 is a high-severity Free of Memory not on the Heap (CWE-590) vulnerability in Microsoft Office Long Term Servicing Channel. Its CVSS base score is 7.8 (High).

Operationally, ranked in the top 49.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-590

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

microsoft
365 apps
all versions
microsoft
excel
2016
microsoft
office
2019
microsoft
office long term servicing channel
2021, 2024

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References