Internet Explorer 5.01 through 6 SP1 allows remote attackers to spoof the domain of a URL via a "%01" character before an @ sign in the user@domain portion of the URL, which hides the rest of the URL, including the real site, in the address bar, aka the "Improper URL Canonicalization Vulnerability."
Published Jan 6, 2004
4.3
MEDIUMCVSS 2.0
EPSS 26.91%
Description
Internet Explorer 5.01 through 6 SP1 allows remote attackers to spoof the domain of a URL via a "%01" character before an @ sign in the user@domain portion of the URL, which hides the rest of the URL, including the real site, in the address bar, aka the "Improper URL Canonicalization Vulnerability."
Affected products
No data.
- 6.0
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:M/Au:N/C:N/I:P/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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 26.91% (0.26912) | 97.98th | v5 (v2026.06.15) |
| Jun 15, 2026 | 26.91% (0.26912) | 97.78th | v5 (v2026.06.15) |
| Sep 10, 2025 | 64.17% (0.64165) | 98.38th | v4 (v2025.03.14) |
| Mar 30, 2025 | 67.17% (0.67172) | 98.44th | v4 (v2025.03.14) |
| Mar 29, 2025 | 58.99% (0.58994) | 97.45th | v4 (v2025.03.14) |
| Mar 17, 2025 | 67.17% (0.67172) | 98.43th | v4 (v2025.03.14) |
| Dec 12, 2024 | 97.35% (0.97347) | 99.92th | v3 (v2023.03.01) |
| Jun 16, 2024 | 97.36% (0.97356) | 99.90th | v3 (v2023.03.01) |
| Jan 21, 2024 | 97.39% (0.97393) | 99.91th | v3 (v2023.03.01) |
| Mar 7, 2023 | 97.37% (0.97372) | 99.80th | v3 (v2023.03.01) |
| Mar 6, 2023 | 44.55% (0.44552) | 98.36th | v2 (v2022.01.01) |
| Feb 4, 2022 | 44.55% (0.44552) | 97.72th | v2 (v2022.01.01) |
References (13)
- http://www.kb.cert.org/vuls/id/652278 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.securityfocus.com/archive/1/346948 mailing-listx_refsource_BUGTRAQVendor Advisory
- http://www.us-cert.gov/cas/techalerts/TA04-033A.html third-party-advisoryx_refsource_CERTUS Government Resource
- http://www.zapthedingbat.com/security/ex01/vun1.htm x_refsource_MISCExploitVendor Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-004 vendor-advisoryx_refsource_MS
- https://exchange.xforce.ibmcloud.com/vulnerabilities/13935 vdb-entryx_refsource_XF
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A490 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A491 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A510 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A511 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A512 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A513 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A526 vdb-entrysignaturex_refsource_OVAL
Change history (0)
No recorded changes yet.