Vulnerability · Published Nov 15, 2021 · Assigned by JFROG
CVE-2021-42374
Medium 5.3
In plain English
A medium-severity out-of-bounds read in busybox from busybox. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 50.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42374 |
| Alpine:v3.21 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42374 |
| Alpine:v3.22 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42374 |
| Alpine:v3.23 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42374 |
| Alpine:v3.24 | busybox | 1.34.0-r0 | ALPINE-CVE-2021-42374 |
| Debian:12 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42374 |
| Debian:13 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42374 |
| Debian:14 | busybox | 1:1.35.0-1 | DEBIAN-CVE-2021-42374 |
| Ubuntu:22.04:LTS | busybox | 1:1.30.1-7ubuntu2 | UBUNTU-CVE-2021-42374 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
References
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
- FEDORA-2021-5a95823596 vendor-advisory
- FEDORA-2021-c52c0fe490 vendor-advisory
- https://security.netapp.com/advisory/ntap-20211223-0002/
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
- https://lists.debian.org/debian-lts-announce/2025/01/msg00012.html