# CVE-2006-1255: Memory corruption in n/a

> Remote attackers can crash the IMAP service or execute arbitrary code via buffer overflow in LOGIN or SELECT commands.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/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:** 19 Mar 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-24vr-fq5x-chmc

## What is CVE-2006-1255?

CVE-2006-1255 is a critical memory corruption vulnerability in n/a, published on 19 Mar 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Stack-based buffer overflow in the IMAP service in Mercur Messaging 5.0 SP3 and earlier allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a long string to the (1) LOGIN or (2) SELECT command, a different set of attack vectors and possibly a different vulnerability than CVE-2003-1177.

## Which versions are affected by CVE-2006-1255?

It affects 1 product.


Products: Mercur Mercur Messaging.

## How do I fix CVE-2006-1255?

No fix has been published for CVE-2006-1255 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-1255 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-1255 exists.

Public exploit code:

- Mercur v5.0 IMAP SP3 SELECT Buffer Overflow (metasploit)
- Mercur Messaging 2005 IMAP Login Buffer Overflow (metasploit)
- Mercur MailServer 5.0 SP3 - 'IMAP' Remote Buffer Overflow (1) (exploitdb)
- Mercur MailServer 5.0 SP3 - 'IMAP' Remote Buffer Overflow (2) (exploitdb)
- Mercur Messaging 2005 - IMAP Remote Buffer Overflow (exploitdb)
- Mercur Messaging 2005 < SP4 - IMAP Remote (Egghunter) (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2005-1657](https://insights.sbomify.com/CVE-2005-1657/): Path traversal in n/a (high 7.5)
- [CVE-2005-1656](https://insights.sbomify.com/CVE-2005-1656/): Information disclosure in n/a (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-1255 and fix it if it is affected.

What it is: CVE-2006-1255 is a critical memory corruption vulnerability in n/a, published on 19 Mar 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-2006-1255 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-2006-1255/ (Markdown: https://insights.sbomify.com/CVE-2006-1255/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-1255
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-1255
- OSV: https://osv.dev/vulnerability/CVE-2006-1255

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-1255/
Summaries are generated and may contain mistakes; the official description above is the record.