# CVE-2005-1807: Denial of service in n/a

> Remote attackers can cause a denial of service via infinite loop in PHPMailer by sending a long header field.

- **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:** Yes
- **Published:** 1 Jun 2005
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2005-1807, GHSA-2qwp-42gw-8pfq

## What is CVE-2005-1807?

CVE-2005-1807 is a medium-severity denial of service vulnerability in n/a, published on 1 Jun 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Data function in class.smtp.php in PHPMailer 1.7.2 and earlier allows remote attackers to cause a denial of service (infinite loop leading to memory and CPU consumption) via a long header field.

## Which versions are affected by CVE-2005-1807?

It affects 1 product.


Products: Phpmailer Phpmailer.

## How do I fix CVE-2005-1807?

Upgrade to a fixed version.

## Is CVE-2005-1807 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2005-1807 exists.

Public exploit code:

- PHPMailer 1.7 - 'Data()' Remote Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2007-3215](https://insights.sbomify.com/CVE-2007-3215/): PHPMailer Shell command injection (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2005-1807 and fix it if it is affected.

What it is: CVE-2005-1807 is a medium-severity denial of service vulnerability in n/a, published on 1 Jun 2005. 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-2005-1807 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-2005-1807/ (Markdown: https://insights.sbomify.com/CVE-2005-1807/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2005-1807
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2005-1807
- OSV: https://osv.dev/vulnerability/CVE-2005-1807

---
From sbomify Insights: https://insights.sbomify.com/CVE-2005-1807/
Summaries are generated and may contain mistakes; the official description above is the record.