CVE-2019-1254 — An information disclosure vulnerability exists when Windows Hyper-V writes unini

An information disclosure vulnerability exists when Windows Hyper-V writes uninitialized memory to disk, aka 'Windows Hyper-V Information Disclosure Vulnerability'.

01What is this vulnerability?

An information disclosure vulnerability exists when Windows Hyper-V writes uninitialized memory to disk, aka 'Windows Hyper-V Information Disclosure Vulnerability'.

02Affected products

Vendor	Product	Versions
Microsoft	Windows Server	2016, 2016 (Core installation), version 1803 (Core Installation), 2019, 2019 (Core installation)
Microsoft	Windows	10 Version 1607 for x64-based Systems, 10 Version 1703 for x64-based Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for x64-based Systems, 10 Version 1809 for x64-based Systems
Microsoft	Windows 10 Version 1903 for x64	based Systems — unspecified
Microsoft	Windows Server, version 1903 (Server Core installation)	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-09-11T21:24:59.000Z
• Last modified: 2024-08-04T18:13:29.582Z

09References

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1254