The (1) CertGetCertificateChain, (2) CertVerifyCertificateChainPolicy, and (3) WinVerifyTrust APIs within the CryptoAPI for Microsoft products including Microsoft Windows 98 through XP, Office for Mac, Internet Explorer for Mac, and Outlook Express for Mac, do not properly verify the Basic Constraints of intermediate CA-signed X.509 certificates, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack for SSL sessions, as originally reported for Internet Explorer and IIS
Published Sep 10, 2002
6.8
MEDIUMCVSS 2.0
EPSS 15.76%
Description
The (1) CertGetCertificateChain, (2) CertVerifyCertificateChainPolicy, and (3) WinVerifyTrust APIs within the CryptoAPI for Microsoft products including Microsoft Windows 98 through XP, Office for Mac, Internet Explorer for Mac, and Outlook Express for Mac, do not properly verify the Basic Constraints of intermediate CA-signed X.509 certificates, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack for SSL sessions, as originally reported for Internet Explorer and IIS.
Affected products
No data.
Configuration 1
- n/a
- n/a
- n/a
- n/a
- 4.0
- 4.0
- n/a
Configuration 2
- n/a
- n/a
- n/a
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: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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 15.76% (0.15760) | 96.77th | v5 (v2026.06.15) |
| Jul 20, 2026 | 15.76% (0.15760) | 96.51th | v5 (v2026.06.15) |
| Jun 20, 2026 | 18.68% (0.18675) | 96.90th | v5 (v2026.06.15) |
| Jun 15, 2026 | 15.76% (0.15760) | 96.44th | v5 (v2026.06.15) |
| Mar 16, 2026 | 17.34% (0.17339) | 94.96th | v4 (v2025.03.14) |
| Dec 28, 2025 | 15.13% (0.15129) | 94.37th | v4 (v2025.03.14) |
| Dec 27, 2025 | 20.15% (0.20154) | 95.33th | v4 (v2025.03.14) |
| Oct 28, 2025 | 15.13% (0.15129) | 94.28th | v4 (v2025.03.14) |
| Oct 27, 2025 | 20.15% (0.20154) | 95.26th | v4 (v2025.03.14) |
| Oct 23, 2025 | 15.13% (0.15129) | 94.27th | v4 (v2025.03.14) |
| Oct 1, 2025 | 12.51% (0.12513) | 93.71th | v4 (v2025.03.14) |
| Mar 30, 2025 | 20.15% (0.20154) | 95.02th | v4 (v2025.03.14) |
| Mar 29, 2025 | 9.67% (0.09673) | 88.09th | v4 (v2025.03.14) |
| Mar 19, 2025 | 20.15% (0.20154) | 94.80th | v4 (v2025.03.14) |
| Mar 17, 2025 | 22.35% (0.22348) | 95.36th | v4 (v2025.03.14) |
| Feb 14, 2025 | 6.08% (0.06083) | 93.54th | v3 (v2023.03.01) |
| Dec 17, 2024 | 8.28% (0.08276) | 94.37th | v3 (v2023.03.01) |
| Feb 9, 2024 | 14.97% (0.14966) | 95.61th | v3 (v2023.03.01) |
| Jan 19, 2024 | 3.44% (0.03435) | 90.57th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.73% (0.03727) | 90.36th | v3 (v2023.03.01) |
| Mar 6, 2023 | 20.65% (0.20648) | 96.51th | v2 (v2022.01.01) |
| Apr 1, 2022 | 20.65% (0.20648) | 96.20th | v2 (v2022.01.01) |
| Feb 4, 2022 | 20.65% (0.20648) | 94.08th | v2 (v2022.01.01) |
References (8)
- http://marc.info/?l=bugtraq&m=102866120821995&w=2 mailing-listx_refsource_BUGTRAQMailing List
- http://marc.info/?l=bugtraq&m=102918200405308&w=2 mailing-listx_refsource_BUGTRAQMailing List
- http://marc.info/?l=bugtraq&m=102976967730450&w=2 mailing-listx_refsource_BUGTRAQMailing List
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-050 vendor-advisoryx_refsource_MSPatchVendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/9776 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1056 vdb-entrysignaturex_refsource_OVALBroken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1332 vdb-entrysignaturex_refsource_OVALBroken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2671 vdb-entrysignaturex_refsource_OVALBroken Link
| Link | Providers | Tags |
|---|---|---|
| http://marc.info/?l=bugtraq&m=102866120821995&w=2 | mailing-listx_refsource_BUGTRAQMailing List | |
| http://marc.info/?l=bugtraq&m=102918200405308&w=2 | mailing-listx_refsource_BUGTRAQMailing List | |
| http://marc.info/?l=bugtraq&m=102976967730450&w=2 | mailing-listx_refsource_BUGTRAQMailing List | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-050 | vendor-advisoryx_refsource_MSPatchVendor Advisory | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/9776 | vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1056 | vdb-entrysignaturex_refsource_OVALBroken Link | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1332 | vdb-entrysignaturex_refsource_OVALBroken Link | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2671 | vdb-entrysignaturex_refsource_OVALBroken Link |
Change history (0)
No recorded changes yet.