What’s Vulnerable › Vulnerabilities

CVE-2008-6564

• Severity: high (CVSS 7.6 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-03-31 · updated 2026-06-16

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.

Affected products

• Nortel Communication Server 1000: all versions
• Nortel Unistim Protocol: all versions

References

• http://osvdb.org/44379
• http://secunia.com/advisories/29747
• http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=713455
• http://www.securityfocus.com/bid/28691
• http://www.securitytracker.com/id?1019847
• http://www.voipshield.com/research-details.php?id=27&s=4&threats_details=&threats_category=0&threats_vendor=0&limit=20&sort=discovered&sortby=DESC
• https://exchange.xforce.ibmcloud.com/vulnerabilities/41801
• http://osvdb.org/44379
• http://secunia.com/advisories/29747
• http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=713455
• http://www.securityfocus.com/bid/28691
• http://www.securitytracker.com/id?1019847

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