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Case File

CVE-2018-18556

CRITICAL · CVSS 9.9 EPSS 15.41% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2018-12-17 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.9. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 15.4% probability of exploitation in the next 30 days.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

External Security References

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2018-18556
Severity
CRITICAL
CVSS
9.9
EPSS
15.41%

Original NVD Description

A privilege escalation issue was discovered in VyOS 1.1.8. The default configuration also allows operator users to execute the pppd binary with elevated (sudo) permissions. Certain input parameters are not properly validated. A malicious operator user can run the binary with elevated permissions and leverage its improper input validation condition to spawn an attacker-controlled shell with root privileges.

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