CVE-2009-0133
CVE-2009-0133 is a critical-severity vulnerability in Microsoft Html Help Workshop with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 67% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.
Key facts
- Severity: Critical (CVSS 2.0 base score 10.0)
- EPSS exploit prediction: 67% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Microsoft Html Help Workshop
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2009-0133?
- 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.
- How severe is CVE-2009-0133?
- CVE-2009-0133 has a CVSS 2.0 base score of 10.0, rated critical severity.
- Is CVE-2009-0133 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 67% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2009-0133?
- CVE-2009-0133 affects Microsoft Html Help Workshop. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2009-0133?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2009-0133 published?
- CVE-2009-0133 was published on 2009-01-15 and last updated on 2026-06-16.
References
Affected products (1)
- cpe:2.3:a:microsoft:html_help_workshop:4.74:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Html Help Workshop
- CVE-2007-0427 — Critical (CVSS 9.3): Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted remote attackers to execute…
- CVE-2007-0352 — Critical (CVSS 9.3): Stack-based buffer overflow in Microsoft Help Workshop 4.03.0002 allows user-assisted remote attackers to execute…
- CVE-2006-0564 — High (CVSS 7.5): Stack-based buffer overflow in Microsoft HTML Help Workshop 4.74.8702.0, and possibly earlier versions, and as included…
All CVEs affecting Microsoft Html Help Workshop →
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