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CVE-2003-0540

MediumPublished

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...

Published: Aug 5, 2003
Updated: Aug 8, 2024
Assigning CNA: mitre
Evidence observed: Aug 4, 2003

Primary CVSS

5.0/ 10Medium

nvd · CVSS 2.0

AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS probability estimate

21.3%

Moderate · next 30 days

Percentile: 97.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Postfix 1.1.x - Denial of Service (1)Exploit
r3b00t · linux · Aug 4, 2003
Postfix 1.1.x - Denial of Service (2)Exploit
[email protected] · linux · Aug 4, 2003

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