Input validation error in Postfix - CVE-2003-0540

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU110625

Input validation error in Postfix - CVE-2003-0540

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


Vulnerability identifier: #VU110625
CSH Severity: Medium
CVSS v4.0: 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
Vendor: Postfix.org
Affected software:
Postfix

Detailed vulnerability 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.


How to mitigate CVE-2003-0540

Install updates from vendor's website.

Sources