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Vulnerability record · CVE-2002-0862 · published 4 October 2002

CVE-2002-0862: Microsoft windows 2000 improper certificate validation vulnerability

Microsoft · Windows 2000

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.

6.8 CVSS 2.0 Medium EPSS 16% · top 3.2% CWE-295 · Improper certificate validation
6.8CVSS 2.0 base score
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
16References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://marc.info/?l=bugtraq&m=102866120821995&w=2 Mailing List
http://marc.info/?l=bugtraq&m=102918200405308&w=2 Mailing List
http://marc.info/?l=bugtraq&m=102976967730450&w=2 Mailing List
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-050 PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/9776 Third Party AdvisoryVDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1056 Broken Link
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1332 Broken Link
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2671 Broken Link
http://marc.info/?l=bugtraq&m=102866120821995&w=2 Mailing List
http://marc.info/?l=bugtraq&m=102918200405308&w=2 Mailing List
http://marc.info/?l=bugtraq&m=102976967730450&w=2 Mailing List
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-050 PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/9776 Third Party AdvisoryVDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1056 Broken Link
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1332 Broken Link
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2671 Broken Link

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Source: NIST National Vulnerability Database (record CVE-2002-0862), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.