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CVE-2025-53766

Microsoft Windows 10 1507 buffer overflow

9.8 CRITICALEPSS 8.03%
  1. Published12 Aug 2025

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft 365 Copilot< 16.0.19127.20000
Microsoft Office< 16.0.14326.22618
Microsoft Windows 10 1507< 10.0.10240.21100
Microsoft Windows 10 1607< 10.0.14393.8330
Microsoft Windows 10 1809< 10.0.17763.7678
Microsoft Windows 10 21h2< 10.0.19044.6216
Microsoft Windows 10 22h2< 10.0.19045.6216
Microsoft Windows 11 22h2< 10.0.22621.5768
Microsoft Windows 11 23h2< 10.0.22631.5768
Microsoft Windows 11 24h2< 10.0.26100.4851
Microsoft Windows Server 2008r2
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.8330
Microsoft Windows Server 2019< 10.0.17763.7678
Microsoft Windows Server 2022< 10.0.20348.3989
Microsoft Windows Server 2022 23h2< 10.0.25398.1791
Microsoft Windows Server 2025< 10.0.26100.4851

Remediation

Fixed in
Microsoft 365 Copilot≥ 16.0.19127.20000
Microsoft Office≥ 16.0.14326.22618
Microsoft Windows 10 1507≥ 10.0.10240.21100
Microsoft Windows 10 1607≥ 10.0.14393.8330
Microsoft Windows 10 1809≥ 10.0.17763.7678
Microsoft Windows 10 21h2≥ 10.0.19044.6216
Microsoft Windows 10 22h2≥ 10.0.19045.6216
Microsoft Windows 11 22h2≥ 10.0.22621.5768
Microsoft Windows 11 23h2≥ 10.0.22631.5768
Microsoft Windows 11 24h2≥ 10.0.26100.4851

References

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Frequently asked

Is CVE-2025-53766 being actively exploited?

CVE-2025-53766 is not in the CISA KEV catalog. Its EPSS exploit probability is 8.03%.

How severe is CVE-2025-53766?

CVE-2025-53766 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 8.03% probability of exploitation.

Which products are affected by CVE-2025-53766?

Affected products include Microsoft 365 Copilot, Microsoft Office, Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, and 12 more.

How do I fix CVE-2025-53766?

Upgrade affected software to a fixed version, for example Microsoft 365 Copilot 16.0.19127.20000, Microsoft Office 16.0.14326.22618, Microsoft Windows 10 1507 10.0.10240.21100 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-53766 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.