{"cve":"CVE-2003-0540","nvd":{"published":"2003-08-27T04:00:00.000","modified":"2026-06-16T22:02:23.597","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717","http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html","http://marc.info/?l=bugtraq&m=106001525130257&w=2","http://marc.info/?l=bugtraq&m=106029188614704&w=2","http://secunia.com/advisories/9433"],"products":["conectiva:linux","wietse_venema:postfix"],"source":"nvd","synced_at":"2026-10-19T19:35:54.859949650+00:00"},"epss":{"cve":"CVE-2003-0540","score":0.21261,"percentile":0.97596,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}