CVE-2021-42374: busybox Out-of-bounds Read
CVSS: 5.3v3.1MediumModified
AliasesALPINE-CVE-2021-42374UBUNTU-CVE-2021-42374DEBIAN-CVE-2021-42374
Published 15-11-2021Last modified 03-11-2025
Vulnerability summary
CVE-2021-42374 is a medium (CVSS 5.3) Out-of-bounds Read vulnerability in busybox. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.8% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.62%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 15-11-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
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
CVSS metrics
6 scores · 5 sources · 2 versionsMedium 5.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:HSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
- NVDNIST5.3MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
Low 3.3Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:P/I:N/A:PSourcesSingle source
EPSS trend
Probability
0.62%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
0.00 pp
From 0.62% on 18-09-2026
18-09-202618-10-2026
EPSS score0.62%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (jfrog.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- busybox≥ 1.27.0, < 1.31.1-r11 | ≥ 1.27.0, < 1.31.1-r21 | ≥ 1.27.0, < 1.32.1-r7 | ≥ 1.27.0, < 1.33.1-r4 | ≥ 1.27.0, < 1.34.0-r0
Busybox1 product
- busybox≥ unspecified, < 1.34.0 | ≥ 1.27.0, ≤ 1.33.1
Debian1 product
- busybox< 1:1.35.0-1
Fedoraproject1 product
- fedoraEOL33 | 34
Ubuntu1 product
- busybox< 1:1.27.2-2ubuntu3.4 | < 1:1.30.1-4ubuntu6.4 | < 1:1.30.1-7ubuntu2
6 vendors · 15 products
References
12 links- jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/REPORTExploitThird Party Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- security.netapp.com/advisory/ntap-20211223-0002/Third Party Advisory
