Buffer overflow in FreeBSD
CVE-2020-24863
A memory corruption vulnerability was found in the kernel function kern_getfsstat in MidnightBSD before 1.2.7 and 1.3 through 2020-08-19, and FreeBSD through 11.4, that allows an attacker to trigger an invalid free and crash the system via a crafted size value in conjunction with an invalid mode.
Vulnerability class: Buffer Overflow
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: 0.005 (42.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.midnightbsd.org/notes/ (Release Notes, Vendor Advisory)
- github.com/MidnightBSD/src/blob/1691c07ff4f27b97220a5d65e217341e477f4014/sys/ke… (Exploit, Third Party Advisory)
- www.midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:01.txt (Exploit, Vendor Advisory)
- www.freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.asc (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-24863?
- CVE-2020-24863 is a medium-severity vulnerability in FreeBSD, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2020-09-03.
- How severe is CVE-2020-24863?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2020-24863 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.