Use After Free in Busybox
CVE-2021-42380
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.031 (87.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.031 · change: +0.002
Affected products
- Busybox — versions unspecified
- Fedoraproject Fedora — versions 33, 34
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…
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-42380?
- CVE-2021-42380 is a high-severity vulnerability in Busybox, classified under Use After Free. CVSS score: 7.2/10. Published 2021-11-15.
- How severe is CVE-2021-42380?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2021-42380 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.