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CVE-2000-0991

• Severity: high (CVSS 7.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2000-12-19 · updated 2026-09-23

Description

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: through 6.0

References

• http://www.securityfocus.com/bid/1815
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-079
• https://exchange.xforce.ibmcloud.com/vulnerabilities/5387
• http://www.securityfocus.com/bid/1815
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-079
• https://exchange.xforce.ibmcloud.com/vulnerabilities/5387

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