CVE-1999-0991

GoodTech Telnet Server NT - Denial of Service via Long Login Name

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-1999-0991. PoCs published by Ussr Labs.

AI-analyzed exploit summary This exploit demonstrates a remote denial of service (DoS) vulnerability in GoodTech Telnet Server NT 2.2.1 by sending an excessively long username (23870+ characters), causing the server to crash due to an unchecked buffer.

Description

Buffer overflow in GoodTech Telnet Server NT allows remote users to cause a denial of service via a long login name.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Ussr Labs · textdoswindows
https://www.exploit-db.com/exploits/19666

This exploit demonstrates a remote denial of service (DoS) vulnerability in GoodTech Telnet Server NT 2.2.1 by sending an excessively long username (23870+ characters), causing the server to crash due to an unchecked buffer.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: GoodTech Telnet Server NT 2.2.1
No auth needed
Prerequisites: Network access to the target telnet server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/862

Scores

EPSS 0.0246
EPSS Percentile 82.3%

Details

Status published
Products (1)
goodtech/telnet_server_nt 2.2.1
Published Dec 06, 1999
Tracked Since Feb 18, 2026