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Vulnerability record · CVE-2021-42375 · published 15 November 2021

CVE-2021-42375: Busybox vulnerability

Busybox · Busybox

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.

5.5 CVSS 3.1 Medium EPSS 0.41% · top 67.4% CWE-159 · CWE-159
5.5CVSS 3.1 base score, v2 1.9
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
10References
17 Jun 2026Last modified by 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.

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

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/ Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR3
https://security.netapp.com/advisory/ntap-20211223-0002/ Third Party Advisory
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/ Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR3
https://security.netapp.com/advisory/ntap-20211223-0002/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-42375), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.