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CVE-2021-34448

Microsoft Windows Scripting Engine Memory Corruption

6.8 MEDIUMActively exploited (CISA KEV)EPSS 40.1%
  1. Published16 Jul 2021
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due17 Nov 2021
Actively exploited (CISA KEV)

Microsoft Windows Scripting Engine contains an unspecified vulnerability that allows for memory corruption.

Added to KEV: 3 Nov 2021Federal remediation due: 17 Nov 2021

Description

Scripting Engine Memory Corruption Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

Microsoft Windows 10 1507< 10.0.10240.19003
Microsoft Windows 10 1607< 10.0.14393.4530
Microsoft Windows 10 1809< 10.0.17763.2061
Microsoft Windows 10 1909< 10.0.18363.1679
Microsoft Windows 10 2004< 10.0.19041.1110
Microsoft Windows 10 20h2< 10.0.19042.1110
Microsoft Windows 10 21h1< 10.0.19043.1110
Microsoft Windows 7all versions
Microsoft Windows 8.1all versions
Microsoft Windows Rt 8.1all versions
Microsoft Windows Server 2008r2
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.4530
Microsoft Windows Server 2019< 10.0.17763.2061

Remediation

Fixed in
Microsoft Windows 10 1507≥ 10.0.10240.19003
Microsoft Windows 10 1607≥ 10.0.14393.4530
Microsoft Windows 10 1809≥ 10.0.17763.2061
Microsoft Windows 10 1909≥ 10.0.18363.1679
Microsoft Windows 10 2004≥ 10.0.19041.1110
Microsoft Windows 10 20h2≥ 10.0.19042.1110
Microsoft Windows 10 21h1≥ 10.0.19043.1110
Microsoft Windows Server 2016≥ 10.0.14393.4530
Microsoft Windows Server 2019≥ 10.0.17763.2061

References

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Frequently asked

Is CVE-2021-34448 being actively exploited?

Yes. CVE-2021-34448 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2021-34448?

CVE-2021-34448 has a CVSS 3.1 base score of 6.8, rated medium. EPSS estimates a 40.1% probability of exploitation.

Which products are affected by CVE-2021-34448?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, and 9 more.

How do I fix CVE-2021-34448?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.19003, Microsoft Windows 10 1607 10.0.14393.4530, Microsoft Windows 10 1809 10.0.17763.2061 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-34448 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.