# CVE-2003-0540

## Summary

- **CVE ID:** CVE-2003-0540
- **Severity:** UNKNOWN
- **CVSS Score:** 2.3
- **CWE:** N/A
- **Published:** Aug 5, 2003
- **Last Modified:** Mar 16, 2026

## Description

The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the ".!" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a ".!" string, which causes an instance of the SMTP listener to lock up.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717)
- [CNA](http://www.securityfocus.com/bid/8333)
- [CNA](http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html)
- [CNA](http://www.kb.cert.org/vuls/id/895508)
- [CNA](http://marc.info/?l=bugtraq&m=106029188614704&w=2)
- [CNA](http://www.mandriva.com/security/advisories?name=MDKSA-2003:081)
- [CNA](http://www.redhat.com/support/errata/RHSA-2003-251.html)
- [CNA](http://www.debian.org/security/2003/dsa-363)
- [CNA](http://marc.info/?l=bugtraq&m=106001525130257&w=2)
- [CNA](http://www.linuxsecurity.com/advisories/engarde_advisory-3517.html)
- [CNA](http://www.novell.com/linux/security/advisories/2003_033_postfix.html)
- [CNA](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A544)
- [CNA](http://secunia.com/advisories/9433)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 57.49%
- **EPSS Percentile:** 98.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._