# CVE-2007-5640: Denial of service in n/a

> Remote attackers can block calls and force re-registration on Nortel IP phones by sending spoofed resume messages to the Signaling Server.

- **Severity:** High 7.1 (`AV:N/AC:M/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Oct 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-v3jg-64qp-m2qp

## What is CVE-2007-5640?

CVE-2007-5640 is a high-severity denial of service vulnerability in n/a, published on 23 Oct 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

## Which versions are affected by CVE-2007-5640?

It affects 9 products.


Products: Nortel Business Communications Manager, Nortel Centrex Ip Client Manager, Nortel Centrex Ip Element Manager, Nortel Meridian Option 11c, Nortel Meridian Option 51c, Nortel Meridian Option 61c, Nortel Meridian Option 81c, Nortel Meridian Sl100, Nortel Mobile Voice Client 2050.

## How do I fix CVE-2007-5640?

No fix has been published for CVE-2007-5640 yet. Limit exposure of the affected software until one is available.

## Is CVE-2007-5640 being exploited?

There is no known exploitation of CVE-2007-5640 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2007-5637](https://insights.sbomify.com/CVE-2007-5637/): Information disclosure in n/a (medium 4.3)
- [CVE-2007-5638](https://insights.sbomify.com/CVE-2007-5638/): Weak cryptography in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-5640 and fix it if it is affected.

What it is: CVE-2007-5640 is a high-severity denial of service vulnerability in n/a, published on 23 Oct 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2007-5640 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2007-5640/ (Markdown: https://insights.sbomify.com/CVE-2007-5640/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-5640
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-5640
- OSV: https://osv.dev/vulnerability/CVE-2007-5640

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-5640/
Summaries are generated and may contain mistakes; the official description above is the record.