• CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
When the Microsoft SMTP service attempts to send a message to a server and receives a 4xx error code, it quickly and repeatedly attempts to redeliver the message, causing a denial of service.
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
  • BUGTRAQ:19990319 Microsoft's SMTP service broken/stupid
  • XF:smtp-4xx-error-dos
Assigning CNA
MITRE Corporation
Date Record Created
19990607 Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Modified (20000105)
Votes (Legacy)
ACCEPT(1) Baker
MODIFY(2) Frech, LeBlanc
REVIEWING(1) Christey
Comments (Legacy)
 Frech> XF:smtp-4xx-error-dos
 LeBlanc> - if we can find a KB or something that shows that this wasn't just
   user error, I'd vote ACCEPT.
 Christey> David Lemson, Microsoft SMTP Service Program Manager,
   posted a followup that said "We have confirmed this as a

Proposed (Legacy)
This is a record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.