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TI-2018-13121 Aliases CVE-2018-18556GHSA-8jmm-6g59-87gc

A privilege escalation issue was discovered in VyOS 1.1.8.

Priority MEDIUM 58Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.15411 96th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:vyos:vyos:1.1.8:*:*:*:*:*:*:*1.1.8VulnerableVyOS
  • cpe:2.3:o:vyos:vyos:1.1.8:*:*:*:*:*:*:* Versions 1.1.8 Vulnerable ·VyOS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-18556
  2. 2026-10-03 Alias added: GHSA-8jmm-6g59-87gc

References

Exploit 3

  • TI-2018-13120 A sandbox escape issue was discovered in VyOS 1.1.8. CVSS 3.0CRITICAL 9.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences