CRITICAL

CVE-2018-18555

CVSS v3

9.9

CRITICAL

EPSS Score

1.8 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2018-18555 yet.

Full record on NVD

Description

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.

Technical details

Published: 2018-12-17

Frequently asked questions

What is CVE-2018-18555?

Is CVE-2018-18555 actively exploited?

Active exploitation of CVE-2018-18555 has not been confirmed. Its EPSS score was 1.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-18555?

CVE-2018-18555 has a CVSS v3 base score of 9.9 (CRITICAL severity).

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