Is CVE-2026-20922 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-20922 being exploited in the wild.

How severe is CVE-2026-20922?

High severity, with a CVSS score of 7.8, published 13 January 2026.

Which products and versions are affected?

Microsoft Windows 11 Versions 22H3, 23H2, 24H2, 25H2; Microsoft Windows Server 2008 R2 Service Pack 1; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2.

Is there a fix for CVE-2026-20922?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-20922 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-20922?

Check whether you run Microsoft Windows 11, Microsoft Windows Server 2008 R2 or Microsoft Windows 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-20922: Microsoft Windows NTFS heap overflow

CVE-2026-20922 · Severity: high · CVSS 7.8 · Published 2026-01-13

A security vulnerability has been identified in the Windows NTFS file system, which is responsible for managing how data is stored and retrieved on hard drives. An attacker who already has basic access to a computer could exploit this flaw to gain full control over the system. This could lead to the theft of sensitive data, the installation of malicious software, or a complete disruption of business operations.

Technologies: Microsoft Windows 11, Microsoft Windows Server 2008 R2, Microsoft Windows 10. Vendors: Microsoft.

Quick answers

Is CVE-2026-20922 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-20922 being exploited in the wild.
How severe is CVE-2026-20922?: High severity, with a CVSS score of 7.8, published 13 January 2026.
Which products and versions are affected?: Microsoft Windows 11 Versions 22H3, 23H2, 24H2, 25H2; Microsoft Windows Server 2008 R2 Service Pack 1; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2.
Is there a fix for CVE-2026-20922?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-20922 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-20922?: Check whether you run Microsoft Windows 11, Microsoft Windows Server 2008 R2 or Microsoft Windows 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow vulnerability (CWE-122) exists within the Windows NTFS driver. The flaw is triggered when the system improperly handles memory allocation during file system operations. An attacker with low-privileged local access can exploit this to execute arbitrary code with elevated privileges. The vulnerability affects a wide range of Windows client and server operating systems, including Windows 10, Windows 11, and Windows Server 2008 R2. Microsoft has released security updates to address this issue.

Affected products

Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
Microsoft Windows 11 Versions 22H3, 23H2, 24H2, 25H2
Microsoft Windows Server 2008 R2 Service Pack 1

Timeline

2026-01-13: disclosed
2026-01-13: advisory

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20922

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