The HTML Help facility in Microsoft Windows 98, 98 Second Edition, Millennium Edition, NT 4.0, NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP uses the Local Computer Security Zone when opening .chm files from the Temporary Internet Files folder, which allows remote attackers to execute arbitrary code via HTML mail that references or inserts a malicious .chm file containing shortcuts that can be executed, aka "Code Execution via Compiled HTML Help File."
Published Sep 1, 2004
7.5
HIGHCVSS 2.0
EPSS 13.74%
Description
The HTML Help facility in Microsoft Windows 98, 98 Second Edition, Millennium Edition, NT 4.0, NT 4.0 Terminal Server Edition, Windows 2000, and Windows XP uses the Local Computer Security Zone when opening .chm files from the Temporary Internet Files folder, which allows remote attackers to execute arbitrary code via HTML mail that references or inserts a malicious .chm file containing shortcuts that can be executed, aka "Code Execution via Compiled HTML Help File."
Affected products
No data.
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- 4.0
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- 4.0
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 13.74% (0.13737) | 96.40th | v5 (v2026.06.15) |
| Jun 15, 2026 | 13.74% (0.13737) | 96.01th | v5 (v2026.06.15) |
| May 7, 2026 | 23.49% (0.23489) | 96.01th | v4 (v2025.03.14) |
| Oct 23, 2025 | 28.96% (0.28961) | 96.33th | v4 (v2025.03.14) |
| Oct 1, 2025 | 31.91% (0.31908) | 96.68th | v4 (v2025.03.14) |
| Jul 20, 2025 | 28.96% (0.28961) | 96.35th | v4 (v2025.03.14) |
| Mar 30, 2025 | 21.82% (0.21823) | 95.27th | v4 (v2025.03.14) |
| Mar 29, 2025 | 31.27% (0.31270) | 94.91th | v4 (v2025.03.14) |
| Mar 19, 2025 | 21.82% (0.21823) | 95.05th | v4 (v2025.03.14) |
| Mar 17, 2025 | 19.52% (0.19517) | 94.93th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.15% (0.02150) | 88.96th | v3 (v2023.03.01) |
| Aug 9, 2023 | 4.00% (0.04003) | 90.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.31% (0.04308) | 91.00th | v3 (v2023.03.01) |
| Mar 6, 2023 | 23.73% (0.23731) | 96.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 23.73% (0.23731) | 94.83th | v2 (v2022.01.01) |
No CWE recorded.
References (3)
- http://www.iss.net/security_center/static/10254.php vdb-entryx_refsource_XFVendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-055 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A403 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://www.iss.net/security_center/static/10254.php | vdb-entryx_refsource_XFVendor Advisory | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-055 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A403 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.