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Known exploited vulnerability

CVE-2023-21674

highCVSS 3.1 8.8In CISA KEVEPSS 34%Published · Microsoft

The short answer

CVE-2023-21674 affects Microsoft Windows 10 Version 1809 and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-01-10: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

Weakness: CWE-416.

Severity

8.8 high

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

Exploited (CISA KEV)

Yes, since Jan 10, 2023

Federal due date Jan 31, 2023

EPSS, next 30 days

34%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected products

Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 10 Version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2023-21674 being exploited?

Yes. CISA added CVE-2023-21674 to its Known Exploited Vulnerabilities catalog on 2023-01-10, with a federal remediation due date of 2023-01-31.

How do I fix CVE-2023-21674?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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