Vulnerability in Facebook Below
CVE-2025-27591
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…
EPSS: 0.004 (27.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.
Affected products
- Facebook Below
- Meta Platforms, Inc Below — versions 0.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
- BridgerAlderson/CVE-2025-27591-PoC
- 0x00Jeff/CVE-2025-27591
- obamalaolu/CVE-2025-27591
- dollarboysushil/Linux-Privilege-Escalation-CVE-2025-27591
- incommatose/CVE-2025-27591-PoC
- rvizx/CVE-2025-27591
- rvzsec/CVE-2025-27591
- Cythonic1/CVE-2025-27591
- 0xDTC/Below-Logger-Symlink-Attack_CVE-2025-27591
- VisaiCyber/CVE-2025-27591-below-
References
- cve-assign@fb.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- cve-assign@fb.com (Patch, x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Mailing List)
Frequently asked questions
- What is CVE-2025-27591?
- CVE-2025-27591 is a medium-severity vulnerability in Facebook Below, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.8/10. Published 2025-03-11.
- How severe is CVE-2025-27591?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2025-27591 known to be exploited?
- 31 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.