CVE-2006-0564

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 71.5% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
7.5EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 72%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 72%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5(low)
EG Risk
67(Track)
EG Risk 67/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation71% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
72%
EPSS %ILE
99%
KEV
Not listed

Published

February 6, 2006

Last Modified

April 16, 2026

References (14)

Data Freshness Timeline

(refreshed 2× in last 7d / 3× 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.

  1. 2026-09-10 09:23 UTCEPSS rescore
  2. 2026-09-05 15:21 UTCEPSS rescore
  3. 2026-08-30 01:14 UTCEPSS rescore
  4. 2026-08-04 15:03 UTCEPSS rescore
  5. 2026-07-26 13:28 UTCEG score recompute▲ 7.50
  6. 2026-07-24 14:11 UTCEPSS rescore
  7. 2026-07-23 00:49 UTCEG score recompute
  8. 2026-07-23 00:29 UTCEG score recompute▼ 6.80
  9. 2026-07-22 23:53 UTCEG score recompute▲ 6.80
  10. 2026-07-22 21:33 UTCEG score recompute
  11. 2026-07-20 17:02 UTCEPSS rescore
  12. 2026-07-15 16:53 UTCEPSS rescore
  13. 2026-07-13 22:25 UTCEPSS rescore
  14. 2026-07-13 06:07 UTCEPSS rescore
  15. 2026-07-13 06:07 UTCEPSS rescore
  16. 2026-07-11 08:22 UTCEPSS rescore
  17. 2026-07-09 19:03 UTCEPSS rescore
  18. 2026-07-08 15:09 UTCEPSS rescore
  19. 2026-07-02 14:00 UTCEPSS rescore
  20. 2026-07-01 15:01 UTCEPSS rescore
  21. 2026-06-25 13:46 UTCEPSS rescore
  22. 2026-06-24 14:01 UTCEPSS rescore
  23. 2026-06-24 14:01 UTCEPSS rescore
  24. 2026-06-23 21:29 UTCEPSS rescore
  25. 2026-06-23 21:29 UTCEPSS rescore
Show 30 more
  1. 2026-06-21 01:56 UTCEPSS rescore
  2. 2026-06-18 17:49 UTCEPSS rescore
  3. 2026-06-18 17:49 UTCEPSS rescore
  4. 2026-06-17 17:49 UTCEPSS rescore
  5. 2026-06-17 17:49 UTCEPSS rescore
  6. 2026-06-16 17:49 UTCEPSS rescore
  7. 2026-06-16 17:49 UTCEPSS rescore
  8. 2026-06-15 17:44 UTCEPSS rescore
  9. 2026-06-13 22:56 UTCEPSS rescore
  10. 2026-06-12 23:08 UTCEPSS rescore
  11. 2026-06-11 13:55 UTCEPSS rescore
  12. 2026-06-10 22:14 UTCEPSS rescore
  13. 2026-06-07 15:21 UTCEPSS rescore
  14. 2026-06-06 13:44 UTCEPSS rescore
  15. 2026-06-06 13:44 UTCEPSS rescore
  16. 2026-06-05 22:43 UTCEPSS rescore
  17. 2026-06-05 06:07 UTCEPSS rescore
  18. 2026-06-05 06:07 UTCEPSS rescore
  19. 2026-05-31 22:28 UTCEPSS rescore
  20. 2026-05-31 10:09 UTCEG score recompute
  21. 2026-05-31 10:09 UTCGHSA enrichment
  22. 2026-05-29 13:40 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-22 21:15 UTCEPSS rescore
  26. 2026-05-22 21:15 UTCEPSS rescore
  27. 2026-05-21 22:38 UTCEPSS rescore
  28. 2026-05-20 22:36 UTCEPSS rescore
  29. 2026-05-20 22:36 UTCEPSS rescore
  30. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (2 Metasploit modules) (8 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16683✓ verified
    First seen Sep 25, 2010

    Microsoft HTML Help Workshop 4.74 - '.hhp' compiled Buffer Overflow (Metasploit) (4)

    Open source ↗
  • Exploit-DBEDB-16648✓ verified
    First seen Sep 25, 2010

    Microsoft HTML Help Workshop 4.74 - '.hhp' Cotent Buffer Overflow (Metasploit) (2)

    Open source ↗
  • Exploit-DBEDB-10321✓ verified
    First seen Dec 5, 2009

    Microsoft HTML Help Workshop 4.74 - '.hhp' Local Buffer Overflow (1)

    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 ↗
  • Metasploitexploit/windows/fileformat/hhw_hhp_contentfile_bof✓ verified
    First seen Feb 6, 2006

    HTML Help Workshop 4.74 (hhp Project File) Buffer Overflow

    Open source ↗
  • Metasploitexploit/windows/fileformat/hhw_hhp_compiledfile_bof✓ verified
    First seen Feb 6, 2006

    HTML Help Workshop 4.74 (hhp Project File) Buffer Overflow

    Open source ↗

Frequently asked(4)

What is CVE-2006-0564?
CVE-2006-0564 is a high vulnerability published on February 6, 2006. 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.
When was CVE-2006-0564 disclosed?
CVE-2006-0564 was first published in the National Vulnerability Database on February 6, 2006, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-0564 actively exploited?
CVE-2006-0564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
How do I remediate CVE-2006-0564?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-0564, 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

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