CVE-2008-6564: Nortel Communication Server 1000
High severity, CVSS 7.6. EPSS: 2.2% chance of exploitation in the next 30 days.
Nortel UNIStim protocol, as used in Communication Server 1000 and other products, uses predictable sequence numbers, which allows remote attackers to hijack sessions via sniffing or brute force attacks.
Affected products
Published 2009-03-31. Last modified 2026-06-16.