CVE-2018-18555 json
A sandbox escape issue was discovered in VyOS 1.1.8.
published 2018-12-17 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10275
- cvss
- 9.9
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.8%
- EPSS 1.8% chance of exploitation in 30 days, percentile 78%
- public exploits
- 0
- none known
Summary
A sandbox escape issue was discovered in VyOS 1.1.8. It provides a restricted management shell for operator users to administer the device. By issuing various shell special characters with certain commands, an authenticated operator user can break out of the management shell and gain access to the underlying Linux shell. The user can then run arbitrary operating system commands with the privileges afforded by their account.
Exploit prediction
1.77% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- blog.vyos.io https://blog.vyos.io/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.9 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
blog.vyos.io
/the-operator-level-is-proved-insecure-and-will-be-removed-in-the-next-releases
exploit, vendor-advisory
Sources
- CVE List CVE-2018-18555
- NVD CVE-2018-18555
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.