Is CVE-2021-42384 in the CISA KEV catalog?

No. CVE-2021-42384 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42384?

CVE-2021-42384 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2021-42384?

CVE-2021-42384 has an EPSS score of 2.54% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42384?

Upgrade busybox on debian 11 to 1:1.30.1-6+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42384

HIGHEPSS 83th pctl

7.2

CVSS v3

NVD

Description

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the handle_special function

CWE-416Use After Free

How to fix

Remediation Available

busyboxDebian

Fixed in:1:1.30.1-6+deb11u1CVE-2021-42384

Fixed in:1:1.35.0-1CVE-2021-42384

busyboxUbuntu

Fixed in:1:1.27.2-2ubuntu3.4USN-5179-1

Fixed in:1:1.30.1-4ubuntu6.4USN-5179-1

busybox-initramfsUbuntu

Fixed in:1:1.27.2-2ubuntu3.4USN-5179-1

Fixed in:1:1.30.1-4ubuntu6.4USN-5179-1

busybox-staticUbuntu

Fixed in:1:1.27.2-2ubuntu3.4USN-5179-1

Fixed in:1:1.30.1-4ubuntu6.4USN-5179-1

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.54%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Third-Party Advisory2

Other references4

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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.