Is CVE-2021-45985 in the CISA KEV catalog?

No. CVE-2021-45985 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-45985?

CVE-2021-45985 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-45985?

CVE-2021-45985 has an EPSS score of 1.42% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-45985?

Install KB5044273 for Windows 10 Version 21H2. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2021-45985

HIGH

7.5

CVSS v3

NVD

Description

In Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

Windows 10 Version 21H2Windows

Install:KB5044273Microsoft

Windows 10 Version 22H2Windows

Install:KB5044273Microsoft

Windows 11 Version 22H2Windows

Install:KB5044285Microsoft

Windows 11 Version 23H2Windows

Install:KB5044285Microsoft

Windows 11 Version 24H2Windows

Install:KB5050009Microsoft

Windows Server 2022Windows

Install:KB5044281Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5044281Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)Windows

Install:KB5044288Microsoft

Windows Server 2025Windows

Install:KB5050009Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5050009Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.42%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Patch1

github.com

Exploit1

lua-users.org

Vendor Advisory1

lua.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-25.