Use After Free in Busybox
CVE-2021-42385
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 evaluate function
Vulnerability class: Use-After-Free
EPSS: 0.026 (83.5th percentile) — read the EPSS interpretation.
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.
Affected products
- Busybox — versions unspecified
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- reefs@jfrog.com (Third Party Advisory)
- reefs@jfrog.com (vendor-advisory)
- reefs@jfrog.com (vendor-advisory)
- reefs@jfrog.com (Third Party Advisory)
- reefs@jfrog.com
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-42385?
- CVE-2021-42385 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-2021-42385?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2021-42385 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.