CVE-2025-27591
CVE-2025-27591 is a medium-severity vulnerability in Facebook Below with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.
Key facts
- Severity: Medium (CVSS 3.x base score 6.8)
- EPSS exploit prediction: 0% (28th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-7209
- Weakness: CWE-732
- Affected product: Facebook Below
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2025-27591?
- CVE-2025-27591 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
- Is CVE-2025-27591 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-27591?
- CVE-2025-27591 affects Facebook Below. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-27591?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-27591 have an EU (EUVD) identifier?
- Yes. CVE-2025-27591 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7209.
- When was CVE-2025-27591 published?
- CVE-2025-27591 was published on 2025-03-11 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:facebook:below:*:*:*:*:*:rust:*:*
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