CVE-2025-27591A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at…
- 6.8MediumCVSS base score
- 0.37%Exploitation in 30 daysEPSS · top 68% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By facebook
- 8 days later
· 8 days later
Published
- 10 days later
· 10 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium6.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | Medium6.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.37% · top 68% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
- affected 0.0.0 – < 0.9.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- crates.iobelowGHSA-9mc5-7qhg-fp3w (opens in a new tab)
References
References3
- https://www.facebook.com/security/advisories/cve-2025-27591 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3 (opens in a new tab)x_refsource_MISC
- http://www.openwall.com/lists/oss-security/2025/03/12/1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-7209 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9mc5-7qhg-fp3w (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-27591)Record last updated .