CVE-1999-0391
UnknownEPSS 4.89%
Last modified
CVE-1999-0391 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.89% chance of exploitation in the next 30 days.
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.
Metrics
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Terminal Server | All versions | — |
| Microsoft | Windows 2000 | All versions | — |
| Microsoft | Windows Nt | 3.5.1 | Sp1 |
| Microsoft | Windows Nt | 4.0 | — |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-1999-0391?
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.
How severe is CVE-1999-0391?
Severity scoring for CVE-1999-0391 is pending analysis. The EPSS model estimates a 4.89% probability of exploitation in the next 30 days.
How do I fix CVE-1999-0391?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-1999-0391?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST