CVE-2018-8753: Clavister Cos Core

Medium severity, CVSS 5.9. EPSS: 1.6% chance of exploitation in the next 30 days.

The IKEv1 implementation in Clavister cOS Core before 11.00.11, 11.20.xx before 11.20.06, and 12.00.xx before 12.00.09 allows remote attackers to decrypt RSA-encrypted nonces by leveraging a Bleichenbacher attack.

Affected products

• Clavister Cos Core: before 11.00.11 (fixed in 11.00.11); from 11.20.00, before 11.20.06 (fixed in 11.20.06); from 12.00.00, before 12.00.09 (fixed in 12.00.09)

Published 2018-08-15. Last modified 2026-06-17.