# CVE-2021-42375

## Summary

- **CVE ID:** CVE-2021-42375
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** CWE-159
- **Published:** Nov 15, 2021
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- busybox — busybox (unspecified)

## References

- [CNA](https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/)
- [CNA](https://security.netapp.com/advisory/ntap-20211223-0002/)
- [CNA](https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.06%
- **EPSS Percentile:** 19.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._