Vulnerability in Busybox
CVE-2021-42375
An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · 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… (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…
Frequently asked questions
- What is CVE-2021-42375?
- CVE-2021-42375 is a medium-severity vulnerability in Busybox, classified under CWE-159. CVSS score: 5.5/10. Published 2021-11-15.
- How severe is CVE-2021-42375?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-42375 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.