The w3svc.dll ISAPI filter in Front Page Server Extensions and ASP.NET for Internet Information Server (IIS) 4.0, 5.0, and 5.1 does not properly handle the error condition when a long URL is provided, which allows remote attackers to cause a denial of service (crash) when the URL parser accesses a null pointer
Published Apr 2, 2003
5.0
MEDIUMCVSS 2.0
EPSS 56.63%
Description
The w3svc.dll ISAPI filter in Front Page Server Extensions and ASP.NET for Internet Information Server (IIS) 4.0, 5.0, and 5.1 does not properly handle the error condition when a long URL is provided, which allows remote attackers to cause a denial of service (crash) when the URL parser accesses a null pointer.
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 (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 56.63% (0.56627) | 99.04th | v5 (v2026.06.15) |
| Aug 17, 2026 | 56.63% (0.56627) | 98.98th | v5 (v2026.06.15) |
| Jul 12, 2026 | 53.29% (0.53290) | 98.86th | v5 (v2026.06.15) |
| Jun 15, 2026 | 56.63% (0.56627) | 98.93th | v5 (v2026.06.15) |
| Feb 12, 2026 | 33.44% (0.33443) | 96.81th | v4 (v2025.03.14) |
| Dec 28, 2025 | 30.98% (0.30982) | 96.57th | v4 (v2025.03.14) |
| Dec 27, 2025 | 26.61% (0.26611) | 96.19th | v4 (v2025.03.14) |
| Oct 28, 2025 | 30.98% (0.30982) | 96.51th | v4 (v2025.03.14) |
| Oct 27, 2025 | 26.61% (0.26611) | 96.11th | v4 (v2025.03.14) |
| Oct 1, 2025 | 30.98% (0.30982) | 96.60th | v4 (v2025.03.14) |
| Jul 30, 2025 | 26.61% (0.26611) | 96.12th | v4 (v2025.03.14) |
| Mar 30, 2025 | 30.98% (0.30982) | 96.35th | v4 (v2025.03.14) |
| Mar 29, 2025 | 17.94% (0.17942) | 92.01th | v4 (v2025.03.14) |
| Mar 17, 2025 | 30.98% (0.30982) | 96.34th | v4 (v2025.03.14) |
| Mar 2, 2025 | 17.14% (0.17142) | 96.15th | v3 (v2023.03.01) |
| Dec 17, 2024 | 14.44% (0.14442) | 95.72th | v3 (v2023.03.01) |
| Apr 17, 2023 | 10.74% (0.10740) | 94.17th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.35% (0.06355) | 92.51th | v3 (v2023.03.01) |
| Mar 6, 2023 | 21.71% (0.21709) | 96.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 21.71% (0.21709) | 96.29th | v2 (v2022.01.01) |
| Feb 4, 2022 | 21.71% (0.21709) | 94.24th | v2 (v2022.01.01) |
No CWE recorded.
References (8)
- http://marc.info/?l=bugtraq&m=101853851025208&w=2 mailing-listx_refsource_BUGTRAQ
- http://www.cert.org/advisories/CA-2002-09.html third-party-advisoryx_refsource_CERTUS Government Resource
- http://www.cisco.com/warp/public/707/Microsoft-IIS-vulnerabilities-MS02-018.shtml vendor-advisoryx_refsource_CISCO
- http://www.iss.net/security_center/static/8800.php vdb-entryx_refsource_XF
- http://www.kb.cert.org/vuls/id/521059 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.osvdb.org/3326 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/4479 vdb-entryx_refsource_BID
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-018 vendor-advisoryx_refsource_MS
| Link | Providers | Tags |
|---|---|---|
| http://marc.info/?l=bugtraq&m=101853851025208&w=2 | mailing-listx_refsource_BUGTRAQ | |
| http://www.cert.org/advisories/CA-2002-09.html | third-party-advisoryx_refsource_CERTUS Government Resource | |
| http://www.cisco.com/warp/public/707/Microsoft-IIS-vulnerabilities-MS02-018.shtml | vendor-advisoryx_refsource_CISCO | |
| http://www.iss.net/security_center/static/8800.php | vdb-entryx_refsource_XF | |
| http://www.kb.cert.org/vuls/id/521059 | third-party-advisoryx_refsource_CERT-VNUS Government Resource | |
| http://www.osvdb.org/3326 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/4479 | vdb-entryx_refsource_BID | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-018 | vendor-advisoryx_refsource_MS |
Change history (0)
No recorded changes yet.