NULL Pointer Dereference Affecting busybox package, versions <1:1.35.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.43% (38th percentile)

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  • Snyk IDSNYK-ECHOLATEST-BUSYBOX-18021417
  • published20 Jul 2026
  • disclosed15 Nov 2021

Introduced: 15 Nov 2021

CVE-2021-42376  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Echo:latest busybox to version 1:1.35.0-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream busybox package and not the busybox package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

A NULL pointer dereference in Busybox's hush applet leads to denial of service when processing a crafted shell command, due to missing validation after a \x03 delimiter character. This may be used for DoS under very rare conditions of filtered command input.

CVSS Base Scores

version 3.1