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Known exploited vulnerability

CVE-2021-41379

mediumCVSS 3.1 5.5In CISA KEVRansomwareEPSS 19%Published · Microsoft

The short answer

CVE-2021-41379 affects Microsoft Windows 10 Version 1507 and is rated medium (CVSS 5.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-03: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Windows Installer Elevation of Privilege Vulnerability

Weakness: CWE-59.

Severity

5.5 medium

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

Exploited (CISA KEV)

Yes, since Mar 3, 2022

Federal due date Mar 17, 2022

EPSS, next 30 days

19%

Higher than 97% of scored CVEs

How it can be exploited

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

What CISA says to do

Apply updates per vendor instructions.

Affected products

Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 1909, Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 21H1, Windows 11 version 21H2, Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 R2 Service Pack 1. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-41379 being exploited?

Yes. CISA added CVE-2021-41379 to its Known Exploited Vulnerabilities catalog on 2022-03-03, with a federal remediation due date of 2022-03-17. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2021-41379?

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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