5.5

CVE-2021-42376: busybox NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesALPINE-CVE-2021-42376DEBIAN-CVE-2021-42376
Published 15-11-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-42376 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in busybox. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 36.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.43%
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 6 · Related 5
MGASA-2021-0533OPENSUSE-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. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

36%

Versus all other CVEs

30-day change

0.00 pp

From 0.43% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.43%

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≥ 1.16.0 (No fix recorded)
Busybox1 product
  • busybox≥ unspecified, < 1.34.0 | ≥ 1.16.0, < 1.34.0
Debian1 product
  • busybox< 1:1.35.0-1
Fedoraproject1 product

5 vendors · 14 products

References

8 links