CVE-2000-0991

Exp

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.

Published: 2000-12-19 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2000-0991 is rated High Exploit Risk (78.8/100): CVSS High severity, with high exploitation likelihood (EPSS 9.69%, 95th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2000-0991

EDB-ID Source Kind Published Link
20307 exploit_db edb 2000-10-18 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2000-0991

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 9.14% 9.69% +0.55%
2 2025-03-30 11.67% 9.14% -2.53%
3 2025-03-29 — 11.67% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2000-0991

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2000-0991

Affected software / configurations for CVE-2000-0991

Vendor Product Version Raw CPE
hilgraeve hyperterminal <= 6.0 cpe:2.3:a:hilgraeve:hyperterminal:*:*:*:*:*:*:*:*

References for CVE-2000-0991

cvelogic Threat Intelligence