CVE-1999-1521

Computalynx CMail 2.3 SP2 and 2.4 - Remote Code Execution via MAIL FROM Command Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-1999-1521. PoCs published by UNYUN.

AI-analyzed exploit summary This exploit targets a buffer overflow in CMail Server 2.3 SP2 via a long MAIL FROM command. It crafts a malicious payload with NOP sleds, a return address, and shellcode to execute arbitrary commands (e.g., launching 'welcome.exe').

Description

Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow attack in the MAIL FROM command that may allow a remote attacker to execute arbitrary code on the server.

Exploits (1)

exploitdb WORKING POC VERIFIED
by UNYUN · cremotewindows
https://www.exploit-db.com/exploits/19495

This exploit targets a buffer overflow in CMail Server 2.3 SP2 via a long MAIL FROM command. It crafts a malicious payload with NOP sleds, a return address, and shellcode to execute arbitrary commands (e.g., launching 'welcome.exe').

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: CMail Server 2.3 SP2
No auth needed
Prerequisites: Network access to the SMTP port (25) · Target running CMail Server 2.3 SP2 on Windows 98
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=93720402717560&w=2
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/2240
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=94121824921783&w=2
Exploit, Vendor Advisory vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/633

Scores

EPSS 0.0805
EPSS Percentile 94.1%

Details

Status published
Products (2)
computalynx/cmail 2.3sp2
computalynx/cmail 2.4
Published Sep 12, 1999
Tracked Since Feb 18, 2026