CVE-2018-8440

Name: CVE-2018-8440
Creator: NVD / NIST
Published: 2018-09-13T00:29:04.333+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 18.53%

Last modified Jun 17, 2026

CVE-2018-8440 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.. CISA has confirmed active exploitation in the wild. EPSS estimates a 18.53% chance of exploitation in the next 30 days.

Description

An elevation of privilege vulnerability exists when Windows improperly handles calls to Advanced Local Procedure Call (ALPC), aka "Windows ALPC Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

18.53%

96.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 18, 2022.

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10 1607	All versions	—
Microsoft	Windows 10 1703	All versions	—
Microsoft	Windows 10 1709	All versions	—
Microsoft	Windows 10 1803	All versions	—
Microsoft	Windows 7	All versions	Sp1
Microsoft	Windows 8.1	All versions	—
Microsoft	Windows Rt 8.1	All versions	—
Microsoft	Windows Server 2008	All versions	Sp2
Microsoft	Windows Server 2008	r2	Sp1
Microsoft	Windows Server 2012	All versions	—
Microsoft	Windows Server 2012	r2	—
Microsoft	Windows Server 2016	All versions	—

References

http://www.securityfocus.com/bid/105153Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041578Third Party Advisory, VDB Entry
https://blog.0patch.com/2018/08/how-we-micropatched-publicly-dropped.htmlExploit, Patch, Third Party Advisory
https://blog.0patch.com/2018/09/comparing-our-micropatch-with.htmlThird Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440Patch, Vendor Advisory
http://www.securityfocus.com/bid/105153Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041578Third Party Advisory, VDB Entry
https://blog.0patch.com/2018/08/how-we-micropatched-publicly-dropped.htmlExploit, Patch, Third Party Advisory
https://blog.0patch.com/2018/09/comparing-our-micropatch-with.htmlThird Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8440US Government Resource

Timeline

Published: Sep 13, 2018
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-8440?

How severe is CVE-2018-8440?

CVE-2018-8440 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 18.53% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-8440?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8440?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST