CVE-1999-0284

IBM Lotus Domino Mail Server - Denial of Service via SMTP HELO Command Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 3 public exploits for CVE-1999-0284. PoCs published by Rootshell.

AI-analyzed exploit summary This exploit targets a buffer overflow vulnerability in Alt-N MDaemon SMTP server via an excessively long HELO command. It sends a crafted HELO command with a large number of 'x' characters to trigger a denial of service or potentially execute arbitrary code.

Description

Denial of service to NT mail servers including Ipswitch, Mdaemon, and Exchange through a buffer overflow in the SMTP HELO command.

Exploits (3)

exploitdb WORKING POC VERIFIED
by Rootshell · cdoswindows
https://www.exploit-db.com/exploits/23146

This exploit targets a buffer overflow vulnerability in Alt-N MDaemon SMTP server via an excessively long HELO command. It sends a crafted HELO command with a large number of 'x' characters to trigger a denial of service or potentially execute arbitrary code.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Alt-N MDaemon 2.71 SP1
No auth needed
Prerequisites: Network access to the SMTP server
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by Rootshell · cremotewindows
https://www.exploit-db.com/exploits/23113

This exploit targets a buffer overflow vulnerability in Microsoft Exchange 5.0 SMTP mail connector (pre-SP2) and MDaemon 2.71 SP1 by sending an excessively long HELO command. It demonstrates a denial-of-service (DoS) condition but notes potential for arbitrary code execution.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Exchange 5.0 (pre-SP2), MDaemon 2.71 SP1
No auth needed
Prerequisites: Network access to SMTP port (25) · Vulnerable version of Microsoft Exchange or MDaemon
devstral-2 · analyzed Feb 16, 2026 Full analysis →
exploitdb WORKING POC VERIFIED
by Rootshell · cdoswindows
https://www.exploit-db.com/exploits/23145

This exploit targets a buffer overflow vulnerability in Ipswitch IMail and MDaemon SMTP servers via an excessively long HELO command. It sends a crafted HELO argument to trigger a denial of service or potential remote code execution.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Ipswitch IMail, MDaemon 2.71 SP1, Microsoft Exchange 5.0 (without SP2)
No auth needed
Prerequisites: Network access to the SMTP server (port 25)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References
Third Party Advisory, VDB Entry x_refsource_misc
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0284

Scores

EPSS 0.1163
EPSS Percentile 95.5%

Details

CWE
CWE-120
Status published
Products (3)
ibm/lotus_domino_mail_server
microsoft/exchange_server 4.0
microsoft/exchange_server 5.0
Published Jan 01, 1998
Tracked Since Feb 18, 2026