CVE-1999-1043: Microsoft Exchange Server

Medium severity, CVSS 5.0. EPSS: 13.2% chance of exploitation in the next 30 days.

Microsoft Exchange Server 5.5 and 5.0 does not properly handle (1) malformed NNTP data, or (2) malformed SMTP data, which allows remote attackers to cause a denial of service (application error).

Affected products

• Microsoft Exchange Server: version 5.0 only; version 5.5 only

Published 1999-12-31. Last modified 2026-06-16.