Is CVE-2024-21820 in the CISA KEV catalog?

No. CVE-2024-21820 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-21820?

CVE-2024-21820 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2024-21820?

CVE-2024-21820 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-21820?

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-2024-21820

HIGH

7.2

CVSS v3

NVD

Description

Incorrect default permissions in some Intel(R) Xeon(R) processor memory controller configurations when using Intel(R) SGX may allow a privileged user to potentially enable escalation of privilege via local access.

CWE-276

How to fix

Remediation Available

intel-microcodeDebian

Fixed in:3.20241112.1~deb11u1CVE-2024-21820

Fixed in:3.20241112.1~deb12u1CVE-2024-21820

Fixed in:3.20241112.1CVE-2024-21820

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 RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-276 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-0632	Critical	9.8	94%	KEV	-
CVE-2017-11610	High	8.8	88%	-	Fix
CVE-2023-29919	Critical	9.1	60%	-	-
CVE-2019-17124	Critical	9.8	23%	-	-
CVE-2020-12608	High	7.8	22%	-	Fix
CVE-2021-3437	Critical	9.8	16%	-	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 2025-11-03.