CVE-2009-0133

NONECVSS 0.0Weaponized

0.0

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.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 99.2%
KEV: Not listed

Published

January 15, 2009

Last Modified

April 23, 2026

References (4)

cve@mitrehttp://securityreason.com/securityalert/4914
cve@mitrehttps://www.exploit-db.com/exploits/7727
af854a3a-2127-422b-91ae-364da2661108http://securityreason.com/securityalert/4914
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/7727

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-119Buffer Operations Within Bounds (Buffer Overflow)

Data Freshness Timeline

(refreshed 13× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-21 01:56 UTCEPSS rescore
2026-06-21 01:56 UTCEPSS rescore
2026-06-19 19:22 UTCEPSS rescore
2026-06-19 19:22 UTCEPSS rescore
2026-06-18 17:49 UTCEPSS rescore
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2026-06-17 17:49 UTCEPSS rescore
2026-06-17 17:49 UTCEPSS rescore
2026-06-16 17:49 UTCEPSS rescore
2026-06-16 17:49 UTCEPSS rescore
2026-06-15 17:44 UTCEPSS rescore
2026-06-14 23:14 UTCEPSS rescore
2026-06-14 23:14 UTCEPSS rescore
2026-06-13 22:57 UTCEPSS rescore
2026-06-12 23:08 UTCEPSS rescore
2026-06-12 23:08 UTCEPSS rescore
2026-06-10 22:14 UTCEPSS rescore
2026-06-10 13:17 UTCEPSS rescore
2026-06-08 14:13 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:44 UTCEPSS rescore
2026-06-06 13:44 UTCEPSS rescore
2026-06-06 13:44 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore

Show 21 more

2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:07 UTCEPSS rescore
2026-06-04 13:09 UTCEPSS rescore
2026-06-04 13:09 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-05-31 00:13 UTCEPSS rescore
2026-05-31 00:13 UTCEPSS rescore
2026-05-30 18:44 UTCEG score recompute
2026-05-30 18:44 UTCGHSA enrichment
2026-05-29 13:40 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-26 13:41 UTCEPSS rescore
2026-05-26 13:41 UTCEPSS rescore
2026-05-26 07:16 UTCEPSS rescore
2026-05-26 07:16 UTCEPSS rescore
2026-05-22 21:15 UTCEPSS rescore
2026-05-22 21:15 UTCEPSS rescore
2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(8 references)

Working exploit code is in the public domain (1 Metasploit module) (7 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-16631✓ verified
First seen Sep 25, 2010
Microsoft HTML Help Workshop 4.74 - '.hhp' Index Buffer Overflow (Metasploit) (3)
Open source ↗
Exploit-DBEDB-10321✓ verified
First seen Dec 5, 2009
Microsoft HTML Help Workshop 4.74 - '.hhp' Local Buffer Overflow (1)
Open source ↗
Metasploitexploit/windows/fileformat/hhw_hhp_indexfile_bof✓ verified
First seen Jan 17, 2009
HTML Help Workshop 4.74 (hhp Project File) Buffer Overflow
Open source ↗
Exploit-DBEDB-7727✓ verified
First seen Jan 12, 2009
Microsoft HTML Workshop 4.74 - Universal Buffer Overflow
Open source ↗
Exploit-DBEDB-1495✓ verified
First seen Feb 14, 2006
Microsoft HTML Help Workshop - '.hhp' Local Buffer Overflow (3)
Open source ↗
Exploit-DBEDB-1490✓ verified
First seen Feb 11, 2006
Microsoft HTML Help Workshop - '.hhp' Local Buffer Overflow (2)
Open source ↗
Exploit-DBEDB-1488✓ verified
First seen Feb 10, 2006
Microsoft HTML Help Workshop - '.hhp' Denial of Service
Open source ↗
Exploit-DBEDB-1470✓ verified
First seen Feb 6, 2006
Microsoft HTML Help Workshop - '.hhp' Local Buffer Overflow (1)
Open source ↗

Frequently asked(4)

What is CVE-2009-0133?

CVE-2009-0133 is a none vulnerability published on January 15, 2009. 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.

When was CVE-2009-0133 disclosed?

CVE-2009-0133 was first published in the National Vulnerability Database on January 15, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2009-0133 actively exploited?

CVE-2009-0133 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2009-0133?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0133, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2009-0133

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CVE-2009-0133

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2009-0133?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(4)

Related CVEs(same CWE)