CVE-1999-0661

Trojan Horse - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-1999-0661. PoCs published by netmask.

AI-analyzed exploit summary This exploit is a trojanized version of sendmail 8.12.6, which includes backdoor code that connects to a remote host (66.37.138.99) on port 6667 upon compilation. The backdoor provides a reverse shell with XOR-encoded communication.

Description

A system is running a version of software that was replaced with a Trojan Horse at one of its distribution points, such as (1) TCP Wrappers 7.6, (2) util-linux 2.9g, (3) wuarchive ftpd (wuftpd) 2.2 and 2.1f, (4) IRC client (ircII) ircII 2.2.9, (5) OpenSSH 3.4p1, or (6) Sendmail 8.12.6.

Exploits (1)

exploitdb TROJAN VERIFIED
by netmask · bashremoteunix
https://www.exploit-db.com/exploits/21919

This exploit is a trojanized version of sendmail 8.12.6, which includes backdoor code that connects to a remote host (66.37.138.99) on port 6667 upon compilation. The backdoor provides a reverse shell with XOR-encoded communication.

Classification
Trojan 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: sendmail 8.12.6
No auth needed
Prerequisites: Compilation of the trojanized sendmail source code
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (10)

Core 10
Core References
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://online.securityfocus.com/archive/1/294539
Third Party Advisory vdb-entry x_refsource_xf
http://www.iss.net/security_center/static/10313.php
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/5921
US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-1999-02.html
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=102821663814127&w=2
US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-1994-14.html
Mailing List mailing-list x_refsource_bugtraq
http://marc.info/?l=bugtraq&m=102820843403741&w=2
US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-1999-01.html
US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-1994-07.html
US Government Resource third-party-advisory x_refsource_cert
http://www.cert.org/advisories/CA-2002-28.html

Scores

EPSS 0.5424
EPSS Percentile 98.9%

Details

Status published
Published Jan 01, 1999
Tracked Since Feb 18, 2026