#VU107269 Out-of-bounds read in Windows and Windows Server - CVE-2025-27733

Vulnerability identifier: #VU107269

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-27733

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in NTFS. A remote attacker can trick a victim to mount a specially crafted VHD, trigger an out-of-bounds read error and read contents of memory on the system, leading to privilege escalation.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows: 10 1607 10.0.14393.10 - 10 1607 10.0.14393.7876, 10 1809 10.0.17763.1 - 10 1809 10.0.17763.7009

Windows Server: 2008 R2 SP1 - 2008 6.0.6003.23168, 2012 Gold - 2012 6.2.9200.25368, 2016 10.0.14393.10 - 2016 10.0.14393.7876, 2019 10.0.17763.1 - 2019 10.0.17763.7009

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External links
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27733

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.