CVE-2025-27591

Name: CVE-2025-27591
Creator: NVD / NIST
Published: 2025-03-11T19:15:43.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2025-27591 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

0.36%

27.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-732

Affected Software

Vendor	Product	Versions
Facebook	Below	< 0.9.0

References

https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3Patch
https://www.facebook.com/security/advisories/cve-2025-27591Patch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/03/12/1Exploit, Mailing List

Timeline

Published: Mar 11, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-27591?

How severe is CVE-2025-27591?

CVE-2025-27591 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2025-27591?

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-2025-27591?

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

Scan your code now

Source: NVD / NIST