CVE-2008-6564

CVE-2008-6564 is a high-severity vulnerability in Nortel Communication Server 1000 with a CVSS 2.0 base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

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.

Frequently asked questions

What is CVE-2008-6564?
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.
How severe is CVE-2008-6564?
CVE-2008-6564 has a CVSS 2.0 base score of 7.6, rated high severity.
Is CVE-2008-6564 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-6564?
CVE-2008-6564 primarily affects Nortel Communication Server 1000. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-6564?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2008-6564 published?
CVE-2008-6564 was published on 2009-03-31 and last updated on 2026-06-16.

References

Affected products (2)