Log in Start free

Vulnerability · Published Mar 19, 2021 · Assigned by mitre

CVE-2021-28831

High 7.5

In plain English

A high-severity security flaw in the busybox package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.7% (higher than 86% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)2.7%top 13.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20busybox1.33.0-r5ALPINE-CVE-2021-28831
Alpine:v3.21busybox1.33.0-r5ALPINE-CVE-2021-28831
Alpine:v3.22busybox1.33.0-r5ALPINE-CVE-2021-28831
Alpine:v3.23busybox1.33.0-r5ALPINE-CVE-2021-28831
Alpine:v3.24busybox1.33.0-r5ALPINE-CVE-2021-28831
Debian:12busybox1:1.35.0-1DEBIAN-CVE-2021-28831
Debian:13busybox1:1.35.0-1DEBIAN-CVE-2021-28831
Debian:14busybox1:1.35.0-1DEBIAN-CVE-2021-28831
Ubuntu:22.04:LTSbusybox1:1.30.1-7ubuntu2UBUNTU-CVE-2021-28831

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-755 · Vector: CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N

References