CVE-2021-42377

Busybox vulnerability

CVSS

9.8

EPSS

3.4%

EPSS pct

88th

Exploited

No known

An attacker-controlled pointer free in Busybox's hush applet leads to denial of service and possible code execution when processing a crafted shell command, due to the shell mishandling the &&& string. This may be used for remote code execution under rare conditions of filtered command input.

Affected vendor

Busybox

Affected product

Busybox

CVSS vector

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

Weakness type (CWE)

CWE-590
CWE-763 — Release of Invalid Pointer or Reference

Published

2021-11-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-42377

Confirm whether Busybox Busybox is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-42377.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-42377

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CRITICAL

CVE-2018-1297

Jmeter vulnerability