Is CVE-2021-42375 in the CISA KEV catalog?

No. CVE-2021-42375 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42375?

CVE-2021-42375 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-42375?

CVE-2021-42375 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42375?

Upgrade busybox on debian 12 to 1:1.35.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-42375

MEDIUM

5.5

CVSS v3

NVD

Description

An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.

CWE-159

How to fix

Remediation Available

busyboxDebian

Fixed in:1:1.35.0-1CVE-2021-42375

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 ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Third-Party Advisory2

Other references3

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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 2025-04-23.