#VU110625 Input validation error in Postfix - CVE-2003-0540

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Main Vulnerability Database Vulnerabilities #VU110625

#VU110625 Input validation error in Postfix - CVE-2003-0540

Published: June 8, 2025 / Updated: June 13, 2025


Vulnerability identifier: #VU110625
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2003-0540
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vulnerable software:
Postfix
Software vendor:
Postfix.org

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack 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.


Remediation

Install updates from vendor's website.

External links