Vulnerability Report

CVE-2025-27591

Title: Facebook Below Auth Bypass

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2025-27591.

CWE Category CWE-732

Published Date Mar 11, 2025

Modified Date Jul 03, 2025

Exploit Status Not Found

Score 6.8 CVSS v3.1

Exploit Probability (EPSS)

0.13%

Vulnerability Summary

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 symlink attacks that manipulate files such as /etc/shadow.

Impacted Vendors

facebook 1

Reference Links

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

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

6.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-27591 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

July 03, 2025 MODIFIED

Vulnerability data or affected products updated.

July 03, 2025 MODIFIED

Vulnerability data updated via NVD.

March 11, 2025 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.