CVE-2000-0991

CVE-2000-0991 is a high-severity vulnerability in Hilgraeve Hyperterminal with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

Frequently asked questions

What is CVE-2000-0991?
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.
How severe is CVE-2000-0991?
CVE-2000-0991 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2000-0991 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0991?
CVE-2000-0991 affects Hilgraeve Hyperterminal. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2000-0991?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2000-0991 published?
CVE-2000-0991 was published on 2000-12-19 and last updated on 2026-06-16.

References

Affected products (1)