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CVE-2025-27591

23
FAUCET Score

CVE-2025-27591 is a privilege escalation vulnerability affecting the Facebook Below service prior to version 0.9.0. It stems from a world-writable directory at /var/log/below, enabling local unprivileged users to escalate privileges to root via symlink attacks, potentially manipulating critical files like /etc/shadow. With a CVSS score of 6.8 (Medium), this vulnerability requires local access but has low attack complexity, leading to high integrity impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.0CPE matchmatch criteria
cpe:2.3:a:facebook:below:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.5
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
28.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 45th percentile among its peer group of 3,050 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: belowFixed in: 0.9.0

Vendor Advisories (1)

rustGHSA-9mc5-7qhg-fp3whigh

Below has Incorrect Permission Assignment for Critical Resource

Mar 11, 2025

References

openwall.com / lists/oss-security/2025/03/12/1
ExploitMailing List
github.com / facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3
Patch
facebook.com / security/advisories/cve-2025-27591
PatchVendor Advisory