Read the docs
TI-2009-00122 Aliases CVE-2009-0133GHSA-fpp9-rfqj-mpm6

Buffer overflow in Microsoft HTML Help Workshop 4.74 and earlier allows context-dependent…

Priority HIGH 79CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
Complete · Complete · Complete
Fix status
No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

Buffer overflow in Microsoft HTML Help Workshop 4.74 and earlier allows context-dependent attackers to execute arbitrary code via a .hhp file with a long "Index file" field, possibly a related issue to CVE-2006-0564.

Why it matters now

EPSS 0.67049 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:html_help_workshop:4.74:*:*:*:*:*:*:*4.74VulnerableMicrosoft
  • cpe:2.3:a:microsoft:html_help_workshop:4.74:*:*:*:*:*:*:* Versions 4.74 Vulnerable ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-0133
  2. 2026-10-03 Alias added: GHSA-fpp9-rfqj-mpm6

References

Exploit 1

Advisory 1

  • TI-2006-00547 Stack-based buffer overflow in Microsoft HTML Help Workshop 4.74.8702.0, and possibly… CVSS 2.0HIGH 7.5
  • TI-2007-00342 Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted… CVSS 2.0HIGH 9.3
  • TI-2007-00417 Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted… CVSS 2.0HIGH 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences