CVE-2000-0991: Hilgraeve Hyperterminal

High severity, CVSS 7.5. EPSS: 9.7% chance of exploitation in the next 30 days.

Buffer overflow in Hilgraeve, Inc. HyperTerminal client on Windows 98, ME, and 2000 allows remote attackers to execute arbitrary commands via a long telnet URL, aka the "HyperTerminal Buffer Overflow" vulnerability.

Affected products

• Hilgraeve Hyperterminal: up to and including 6.0

Published 2000-12-19. Last modified 2026-09-23.