Which products and versions are affected by CVE-2006-0564?

Affected: Html Help (Microsoft) versions 1.4; Html Help Workshop (Microsoft) versions 4.74.8702.0. The full list is in the CVE brief.

Is CVE-2006-0564 being exploited in the wild?

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

Is CVE-2006-0564 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-2006-0564?

Public exploit code is available.

Is there a fix for CVE-2006-0564?

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

How urgently should CVE-2006-0564 be patched?

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

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Vulnerability Intelligence

CVE-2006-0564

HighPublic exploit

Stack-based buffer overflow in Microsoft HTML Help Workshop 4.74.8702.0, and possibly earlier versions, and as included in the Microsoft HTML Help 1.4 SDK, allows context-dependent attackers to execute arbitrary code via a .hhp file with a long Contents file field.

Published Feb 6, 2006 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-2006-0564 is a high-severity vulnerability (CVSS 7.5 v2) affecting Html Help (Microsoft), Html Help Workshop (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 72% 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

7.5

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

EPSS (30-day exploit likelihood)

72%

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-2006-0564 brief as a PDF

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

Description

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Html HelpMicrosoft	1.4	n/a
Html Help WorkshopMicrosoft	4.74.8702.0	n/a

Timeline

Publicly disclosed
Feb 6, 2006
Last updated
Apr 15, 2026

References

12 more references in the full CVE brief

FAQ

Common Questions.

Stack-based buffer overflow in Microsoft HTML Help Workshop 4.74.8702.0, and possibly earlier versions, and as included in the Microsoft HTML Help 1.4 SDK, allows context-dependent attackers to execute arbitrary code via a .hhp file with a long Contents file field.
Affected: Html Help (Microsoft) versions 1.4; Html Help Workshop (Microsoft) versions 4.74.8702.0. 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-2006-0564 Running On Your Attack Surface?

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