# CVE-2006-0738: Memory corruption in n/a

> Remote attackers can cause a denial of service in eStara SIP softphone by sending malicious SIP INVITE requests with format string specifiers.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Feb 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-w77f-7cjw-q58r

## What is CVE-2006-0738?

CVE-2006-0738 is a medium-severity memory corruption vulnerability in n/a, published on 17 Feb 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple format string vulnerabilities in eStara SIP softphone allow remote attackers to cause a denial of service (hang) via SIP INVITE requests with format string specifiers in the SDP session description, as demonstrated using (1) the field name, (2) the o field (owner/creator and session identifier), or (3) the m field (media name and transport address).

## Which versions are affected by CVE-2006-0738?

It affects 1 product.


Products: Estara Softphone.

## How do I fix CVE-2006-0738?

No fix has been published for CVE-2006-0738 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-0738 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-0738 exists.

Public exploit code:

- eStara SoftPhone 3.0.1 - SIP SDP Message Handling Format String Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2006-0189](https://insights.sbomify.com/CVE-2006-0189/): Memory corruption in n/a (high 7.5)
- [CVE-2006-0737](https://insights.sbomify.com/CVE-2006-0737/): Denial of service in n/a (medium 5.0)
- [CVE-2006-0739](https://insights.sbomify.com/CVE-2006-0739/): Integer overflow in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-0738 and fix it if it is affected.

What it is: CVE-2006-0738 is a medium-severity memory corruption vulnerability in n/a, published on 17 Feb 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-0738 exists.

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-2006-0738/ (Markdown: https://insights.sbomify.com/CVE-2006-0738/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-0738
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-0738
- OSV: https://osv.dev/vulnerability/CVE-2006-0738

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-0738/
Summaries are generated and may contain mistakes; the official description above is the record.