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Known exploited vulnerability

CVE-2021-34448

mediumCVSS 3.1 6.8In CISA KEVEPSS 40%Published · Microsoft

The short answer

CVE-2021-34448 affects Microsoft Windows 10 Version 1507 and is rated medium (CVSS 6.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

Scripting Engine Memory Corruption Vulnerability

Weakness: CWE-787.

Severity

6.8 medium

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

Exploited (CISA KEV)

Yes, since Nov 3, 2021

Federal due date Nov 17, 2021

EPSS, next 30 days

40%

Higher than 99% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
None

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 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 R2 Service Pack 1, Windows Server 2012. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-34448 being exploited?

Yes. CISA added CVE-2021-34448 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2021-11-17.

How do I fix CVE-2021-34448?

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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