5.5

CVE-2021-42375: busybox

CVSS: 5.5v3.1MediumModified
AliasesALPINE-CVE-2021-42375UBUNTU-CVE-2021-42375DEBIAN-CVE-2021-42375
Published 15-11-2021Last modified 23-04-2025
Open JSON

Vulnerability summary

CVE-2021-42375 is a medium (CVSS 5.5) vulnerability in busybox. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.6% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
OPENSUSE-SU-2022:0135-1SUSE-SU-2022:0135-1SUSE-SU-2022:0135-2SUSE-SU-2022:3959-1SUSE-SU-2022:4253-1

Timeline

  1. 15-11-2021
    PublishedVulnerability first disclosed.
  2. 23-04-2025
    Last modifiedVulnerability information updated.

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 metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

0.00 pp

From 0.41% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Netapp10 products
Alpine1 product
  • busybox< 1.32.1-r7 | < 1.33.1-r5 | < 1.34.0-r0
Busybox1 product
  • busybox≥ unspecified, < 1.34.0 | 1.33.1
Debian1 product
  • busybox< 1:1.35.0-1
Fedoraproject1 product
Ubuntu1 product
  • busybox< 1:1.27.2-2ubuntu3.3 | < 1:1.30.1-4ubuntu6.3 | < 1:1.30.1-6ubuntu3

6 vendors · 15 products

References

9 links