IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" vulnerability
Published Jul 12, 2000
5.0
MEDIUMCVSS 2.0
EPSS 57.96%
Description
IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" 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:N/I:N/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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 57.96% (0.57964) | 99.06th | v5 (v2026.06.15) |
| Aug 17, 2026 | 57.96% (0.57964) | 99.01th | v5 (v2026.06.15) |
| Jul 29, 2026 | 55.86% (0.55861) | 98.94th | v5 (v2026.06.15) |
| Jul 26, 2026 | 39.36% (0.39364) | 98.46th | v5 (v2026.06.15) |
| Jul 12, 2026 | 55.86% (0.55861) | 98.93th | v5 (v2026.06.15) |
| Jun 15, 2026 | 57.96% (0.57964) | 98.97th | v5 (v2026.06.15) |
| Dec 28, 2025 | 74.02% (0.74022) | 98.78th | v4 (v2025.03.14) |
| Dec 27, 2025 | 22.42% (0.22416) | 95.66th | v4 (v2025.03.14) |
| Oct 28, 2025 | 74.02% (0.74022) | 98.76th | v4 (v2025.03.14) |
| Oct 27, 2025 | 22.42% (0.22416) | 95.58th | v4 (v2025.03.14) |
| Oct 17, 2025 | 74.02% (0.74022) | 98.76th | v4 (v2025.03.14) |
| Oct 16, 2025 | 68.41% (0.68407) | 98.53th | v4 (v2025.03.14) |
| Oct 1, 2025 | 74.02% (0.74022) | 98.79th | v4 (v2025.03.14) |
| Jul 30, 2025 | 22.42% (0.22416) | 95.58th | v4 (v2025.03.14) |
| Mar 30, 2025 | 74.02% (0.74022) | 98.75th | v4 (v2025.03.14) |
| Mar 29, 2025 | 57.69% (0.57693) | 97.36th | v4 (v2025.03.14) |
| Mar 19, 2025 | 74.02% (0.74022) | 98.73th | v4 (v2025.03.14) |
| Mar 17, 2025 | 82.06% (0.82059) | 99.16th | v4 (v2025.03.14) |
| Dec 12, 2024 | 75.85% (0.75848) | 98.29th | v3 (v2023.03.01) |
| Feb 8, 2024 | 75.85% (0.75848) | 98.06th | v3 (v2023.03.01) |
| Mar 7, 2023 | 94.27% (0.94267) | 98.65th | v3 (v2023.03.01) |
| Mar 6, 2023 | 24.73% (0.24729) | 96.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 24.73% (0.24729) | 95.30th | v2 (v2022.01.01) |
No CWE recorded.
References (4)
- http://www.microsoft.com/technet/support/kb.asp?ID=260205 vendor-advisoryx_refsource_MSKB
- http://www.securityfocus.com/bid/1190 vdb-entryx_refsource_BID
- http://www.ussrback.com/labs40.html x_refsource_MISC
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-030 vendor-advisoryx_refsource_MS
| Link | Providers | Tags |
|---|---|---|
| http://www.microsoft.com/technet/support/kb.asp?ID=260205 | vendor-advisoryx_refsource_MSKB | |
| http://www.securityfocus.com/bid/1190 | vdb-entryx_refsource_BID | |
| http://www.ussrback.com/labs40.html | x_refsource_MISC | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-030 | vendor-advisoryx_refsource_MS |
Change history (0)
No recorded changes yet.