Which products and versions are affected by CVE-2000-1089?

Affected: Windows 2000 (Microsoft); Windows Nt (Microsoft) versions 4.0. The full list is in the CVE brief.

Is CVE-2000-1089 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2000-1089 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2000-1089?

Public exploit code is available.

Is there a fix for CVE-2000-1089?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2000-1089 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2000-1089

CriticalPublic exploit

Buffer overflow in Microsoft Phone Book Service allows local users to execute arbitrary commands, aka the "Phone Book Service Buffer Overflow" vulnerability.

Published Jan 9, 2001 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2000-1089 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Windows 2000 (Microsoft), Windows Nt (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 75% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

75%

Higher than 99.4% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2000-1089 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Buffer overflow in Microsoft Phone Book Service allows local users to execute arbitrary commands, aka the "Phone Book Service Buffer Overflow" vulnerability.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Windows 2000Microsoft	See advisory	n/a
Windows NtMicrosoft	4.0	n/a

Timeline

Publicly disclosed
Jan 9, 2001
Last updated
Apr 15, 2026

References

2 more references in the full CVE brief

FAQ

Common Questions.

Buffer overflow in Microsoft Phone Book Service allows local users to execute arbitrary commands, aka the "Phone Book Service Buffer Overflow" vulnerability.
Affected: Windows 2000 (Microsoft); Windows Nt (Microsoft) versions 4.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2000-1089 Running On Your Attack Surface?

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