CVE-2008-6564

7.6 HIGH 2% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 2.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-03-31 17:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:02 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.2% in the next 30 days (EPSS).
Severity: 7.6 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-03-31 17:30 UTC
Last modified: 2026-06-16 23:02 UTC
Exploit probability: 2.2% · EPSS, next 30 days
Record status: Modified

Affected

Nortel Communication Server 1000
Nortel Unistim Protocol

Attack profile CVSS 2.0 · 7.6

Attack vector: Network
Complexity: High
Authentication: None
Confidentiality: Complete
Integrity: Complete
Availability: Complete

Raw vector

AV:N/AC:H/Au:N/C:C/I:C/A:C

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2008-6564.md and follow it. Check whether this project is affected by CVE-2008-6564. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record