CVE-2020-24863

Name: CVE-2020-24863
Creator: NVD / NIST
Published: 2020-09-03T15:15:11.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2020-24863 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.53%

40.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Midnightbsd	Midnightbsd	< 1.2.7
Midnightbsd	Midnightbsd	>= 1.3, <= 2020-08-19
Freebsd	Freebsd	<= 11.4

References

http://www.midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:01.txtExploit, Vendor Advisory
https://github.com/MidnightBSD/src/blob/1691c07ff4f27b97220a5d65e217341e477f4014/sys/kern/vfs_syscalls.cExploit, Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.ascPatch, Vendor Advisory
https://www.midnightbsd.org/notes/Release Notes, Vendor Advisory
http://www.midnightbsd.org/security/adv/MIDNIGHTBSD-SA-20:01.txtExploit, Vendor Advisory
https://github.com/MidnightBSD/src/blob/1691c07ff4f27b97220a5d65e217341e477f4014/sys/kern/vfs_syscalls.cExploit, Third Party Advisory
https://www.freebsd.org/security/advisories/FreeBSD-EN-20:18.getfsstat.ascPatch, Vendor Advisory
https://www.midnightbsd.org/notes/Release Notes, Vendor Advisory

Timeline

Published: Sep 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24863?

How severe is CVE-2020-24863?

CVE-2020-24863 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24863?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24863?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST