Out-of-bounds Read in Busybox
CVE-2021-42374
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
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and… (Exploit, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20211223-0002/ (Third Party Advisory)
- claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-cl…
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-42374?
- CVE-2021-42374 is a medium-severity vulnerability in Busybox, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2021-11-15.
- How severe is CVE-2021-42374?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2021-42374 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.