IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.htr" to the requested URL, which causes the files to be parsed by the .HTR ISAPI extension, aka a variant of the "File Fragment Reading via .HTR" vulnerability
Published Sep 18, 2001
5.0
MEDIUMCVSS 2.0
EPSS 28.21%
Description
IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.htr" to the requested URL, which causes the files to be parsed by the .HTR ISAPI extension, aka a variant of the "File Fragment Reading via .HTR" vulnerability.
Affected products
No data.
- 4.0
- 5.0
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:N/A:N
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 (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 28.21% (0.28215) | 98.06th | v5 (v2026.06.15) |
| Aug 17, 2026 | 28.21% (0.28215) | 97.95th | v5 (v2026.06.15) |
| Jul 29, 2026 | 26.66% (0.26661) | 97.82th | v5 (v2026.06.15) |
| Jul 26, 2026 | 20.04% (0.20044) | 97.17th | v5 (v2026.06.15) |
| Jul 12, 2026 | 26.66% (0.26661) | 97.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 28.21% (0.28215) | 97.86th | v5 (v2026.06.15) |
| Jan 8, 2026 | 74.23% (0.74228) | 98.79th | v4 (v2025.03.14) |
| Dec 28, 2025 | 76.17% (0.76172) | 98.88th | v4 (v2025.03.14) |
| Dec 27, 2025 | 33.05% (0.33047) | 96.76th | v4 (v2025.03.14) |
| Oct 28, 2025 | 76.17% (0.76172) | 98.87th | v4 (v2025.03.14) |
| Oct 27, 2025 | 33.05% (0.33047) | 96.70th | v4 (v2025.03.14) |
| Oct 17, 2025 | 76.17% (0.76172) | 98.87th | v4 (v2025.03.14) |
| Oct 16, 2025 | 72.25% (0.72247) | 98.69th | v4 (v2025.03.14) |
| Oct 1, 2025 | 76.17% (0.76172) | 98.89th | v4 (v2025.03.14) |
| Jul 30, 2025 | 33.05% (0.33047) | 96.72th | v4 (v2025.03.14) |
| Mar 30, 2025 | 76.17% (0.76172) | 98.86th | v4 (v2025.03.14) |
| Mar 29, 2025 | 65.01% (0.65010) | 97.87th | v4 (v2025.03.14) |
| Mar 17, 2025 | 76.17% (0.76172) | 98.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 87.25% (0.87253) | 98.76th | v3 (v2023.03.01) |
| Aug 19, 2023 | 87.25% (0.87253) | 98.19th | v3 (v2023.03.01) |
| Mar 7, 2023 | 92.54% (0.92543) | 98.39th | v3 (v2023.03.01) |
| Mar 6, 2023 | 13.53% (0.13525) | 95.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 13.53% (0.13525) | 95.40th | v2 (v2022.01.01) |
| Feb 4, 2022 | 13.53% (0.13525) | 90.66th | v2 (v2022.01.01) |
No CWE recorded.
References (4)
- http://marc.info/?l=bugtraq&m=97897954625305&w=2 mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/2313 vdb-entryx_refsource_BID
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-004 vendor-advisoryx_refsource_MS
- https://exchange.xforce.ibmcloud.com/vulnerabilities/5903 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://marc.info/?l=bugtraq&m=97897954625305&w=2 | mailing-listx_refsource_BUGTRAQ | |
| http://www.securityfocus.com/bid/2313 | vdb-entryx_refsource_BID | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-004 | vendor-advisoryx_refsource_MS | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/5903 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.