Is CVE-2021-33120 in the CISA KEV catalog?

No. CVE-2021-33120 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33120?

CVE-2021-33120 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-33120?

CVE-2021-33120 has an EPSS score of 1.02% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33120?

Upgrade intel-microcode on debian 11 to 3.20220207.1~deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-33120

MEDIUM

5.4

CVSS v3

NVD

Description

Out of bounds read under complex microarchitectural condition in memory subsystem for some Intel Atom(R) Processors may allow authenticated user to potentially enable information disclosure or cause denial of service via network access.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

intel-microcodeDebian

Fixed in:3.20220207.1~deb11u1CVE-2021-33120

Fixed in:3.20220207.1CVE-2021-33120

intel-microcodeUbuntu

Fixed in:3.20220510.0ubuntu0.16.04.1+esm1USN-5535-1

Fixed in:3.20220510.0ubuntu0.18.04.1USN-5486-1

Fixed in:3.20220510.0ubuntu0.20.04.1USN-5486-1

Fixed in:3.20220510.0ubuntu0.22.04.1USN-5486-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

1.02%probability of exploitation in 30 days

59thpercentile

Moderate risk: more likely to be exploited than 59% of all known CVEs.

References

Vendor Advisory1

intel.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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 2025-05-05.