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Vulnerability record · CVE-1999-0391 · published 5 January 1999

CVE-1999-0391: Microsoft terminal server vulnerability

Microsoft · Terminal Server

The cryptographic challenge of SMB authentication in Windows 95 and Windows 98 can be reused, allowing an attacker to replay the response and impersonate a user.

7.5 CVSS 2.0 High EPSS 4.9% · top 8.2%
7.5CVSS 2.0 base score
4.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
16 Jun 2026Last modified by NVD

Description

The cryptographic challenge of SMB authentication in Windows 95 and Windows 98 can be reused, allowing an attacker to replay the response and impersonate a user.

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

Affected products

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

References

LinkTags
https://marc.info/?l=bugtraq&m=91552769809542&w=2
https://marc.info/?l=bugtraq&m=91552769809542&w=2

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-1999-0391), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.