Is CVE-2024-21853 in the CISA KEV catalog?

No. CVE-2024-21853 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-21853?

CVE-2024-21853 has a CVSS v3 base score of 4.7 (MEDIUM).

What is the EPSS score for CVE-2024-21853?

CVE-2024-21853 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-21853?

Upgrade intel-microcode on debian 11 to 3.20241112.1~deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2024-21853

MEDIUM

4.7

CVSS v3

NVD

Description

Improper finite state machines (FSMs) in the hardware logic in some 4th and 5th Generation Intel(R) Xeon(R) Processors may allow an authorized user to potentially enable denial of service via local access.

CWE-1245

How to fix

Remediation Available

intel-microcodeDebian

Fixed in:3.20241112.1~deb11u1CVE-2024-21853

Fixed in:3.20241112.1~deb12u1CVE-2024-21853

Fixed in:3.20241112.1CVE-2024-21853

intel-microcodeUbuntu

Fixed in:3.20241112.0ubuntu0.16.04.1+esm1USN-7149-1

Fixed in:3.20241112.0ubuntu0.18.04.1+esm1USN-7149-1

Fixed in:3.20241112.0ubuntu0.20.04.1USN-7149-1

Fixed in:3.20241112.0ubuntu0.22.04.1USN-7149-1

Fixed in:3.20241112.0ubuntu0.24.04.1USN-7149-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Other references2

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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 2025-11-03.