# CVE-2003-1109: Denial of service in n/a

> Remote attackers can cause denial of service or execute arbitrary code via crafted SIP INVITE messages in Cisco IP phones, IOS, and PIX firewalls.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/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:** 11 Mar 2005
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-cvf6-xm2v-cq3c

## What is CVE-2003-1109?

CVE-2003-1109 is a high-severity denial of service vulnerability in Cisco Ios, published on 11 Mar 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Session Initiation Protocol (SIP) implementation in multiple Cisco products including IP Phone models 7940 and 7960, IOS versions in the 12.2 train, and Secure PIX 5.2.9 to 6.2.2 allows remote attackers to cause a denial of service and possibly execute arbitrary code via crafted INVITE messages, as demonstrated by the OUSPG PROTOS c07-sip test suite.

## Which versions are affected by CVE-2003-1109?

It affects 4 products.


Products: Cisco Ios, Cisco Ip Phone 7940, Cisco Ip Phone 7960, Cisco Pix Firewall Software.

## How do I fix CVE-2003-1109?

No fix has been published for CVE-2003-1109 yet. Limit exposure of the affected software until one is available.

## Is CVE-2003-1109 being exploited?

There is no known exploitation of CVE-2003-1109 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2003-1109 and fix it if it is affected.

What it is: CVE-2003-1109 is a high-severity denial of service vulnerability in Cisco Ios, published on 11 Mar 2005. 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-2003-1109 in the wild and no public exploit code.

Affected product: Cisco Ios. 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-2003-1109/ (Markdown: https://insights.sbomify.com/CVE-2003-1109/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2003-1109
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2003-1109
- OSV: https://osv.dev/vulnerability/CVE-2003-1109

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From sbomify Insights: https://insights.sbomify.com/CVE-2003-1109/
Summaries are generated and may contain mistakes; the official description above is the record.