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CVE-2025-27591 — Vulnerability in below — CVE Details

HIGH

Below has Incorrect Permission Assignment for Critical Resource

Published March 11, 2025Updated February 8, 2026Source: osv

Summary

### Impact 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. ### Patches https://github.com/facebookincubator/below/commit/10e73a21d67baa2cd613ee92ce999cda145e1a83 This is included in version 0.9.0 ### Workarounds Change the permission on `/var/log/below` manually ### References https://www.facebook.com/security/advisories/cve-2025-27591 https://www.cve.org/CVERecord?id=CVE-2025-27591

Advisory Timeline

  • First published March 11, 2025 (580 days ago).
  • Last revised February 8, 2026 — 333 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update below to 0.9.0 or later
cargo update -p below --precise 0.9.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
below
crates.io
All versions0.9.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-732
    Incorrect Permission AssignmentMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.8 score means for each attack dimension.

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

References

Frequently Asked Questions

What is CVE-2025-27591?
Below has Incorrect Permission Assignment for Critical Resource This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.8/10).
How do I check if my project is affected by CVE-2025-27591?
CVE-2025-27591 affects below. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-27591 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-9mc5-7qhg-fp3w
RUSTSEC-2025-0149

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