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Vulnerability record · CVE-2025-53766 · published 12 August 2025

CVE-2025-53766: Microsoft 365 copilot heap-based buffer overflow vulnerability

Microsoft · 365 Copilot

Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.

9.8 CVSS 3.1 Critical EPSS 8.0% · top 5.4% CWE-122 · Heap-based buffer overflow
9.8CVSS 3.1 base score
8.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.

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

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53766 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-53766), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.