# CVE-2003-0743

## Summary

- **CVE ID:** CVE-2003-0743
- **Severity:** UNKNOWN
- **CVSS Score:** 0.28
- **CWE:** N/A
- **Published:** Sep 6, 2003
- **Last Modified:** Mar 16, 2026

## Description

Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36 and Exim 4 (exim4) before 4.21 may allow remote attackers to execute arbitrary code via an invalid (1) HELO or (2) EHLO argument with a large number of spaces followed by a NULL character and a newline, which is not properly trimmed before the "(no argument given)" string is appended to the buffer.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](http://www.debian.org/security/2003/dsa-376)
- [CNA](http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000735)
- [CNA](http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057720.html)
- [CNA](http://www.exim.org/pipermail/exim-announce/2003q3/000094.html)
- [CNA](http://marc.info/?l=bugtraq&m=106252015820395&w=2)
- [CNA](http://marc.info/?l=vuln-dev&m=106264740820334&w=2)
- [CNA](http://www.exim.org/pipermail/exim-users/Week-of-Mon-20030811/057809.html)
- [CNA](http://packages.debian.org/changelogs/pool/main/e/exim/exim_3.36-13/changelog)
- [CNA](http://packages.debian.org/changelogs/pool/main/e/exim4/exim4_4.34-10/changelog)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 7.02%
- **EPSS Percentile:** 91.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._