CVE-2025-27591

CVSS 6.8 MEDIUMEPSS 0.4%

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.

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

Affected products

Meta Platforms, Inc · below

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References

https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3 https://www.facebook.com/security/advisories/cve-2025-27591 http://www.openwall.com/lists/oss-security/2025/03/12/1