CVE-2020-25584

Name: CVE-2020-25584
Creator: NVD / NIST
Published: 2021-04-07T15:15:13.013+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2020-25584 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In FreeBSD 13.0-STABLE before n245118, 12.2-STABLE before r369552, 11.4-STABLE before r369560, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, a superuser inside a FreeBSD jail configured with the non-default allow.mount permission could cause a race condition between the lookup of ".." and remounting a filesystem, allowing access to filesystem hierarchy outside of the jail.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

In FreeBSD 13.0-STABLE before n245118, 12.2-STABLE before r369552, 11.4-STABLE before r369560, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, a superuser inside a FreeBSD jail configured with the non-default allow.mount permission could cause a race condition between the lookup of ".." and remounting a filesystem, allowing access to filesystem hierarchy outside of the jail.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.18%

7.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

Vendor	Product	Versions	Update
Freebsd	Freebsd	< 11.4	—
Freebsd	Freebsd	>= 12.0, < 12.2	—
Freebsd	Freebsd	11.4	—
Freebsd	Freebsd	12.2	—
Freebsd	Freebsd	13.0	Beta1

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-21:10.jail_mount.ascVendor Advisory
https://security.netapp.com/advisory/ntap-20210423-0009/Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-21:10.jail_mount.ascVendor Advisory
https://security.netapp.com/advisory/ntap-20210423-0009/Third Party Advisory

Timeline

Published: Apr 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25584?

How severe is CVE-2020-25584?

CVE-2020-25584 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25584?

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-2020-25584?

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

Scan your code now

Source: NVD / NIST