CVE-2000-0834: n/a vulnerability

CVE-2000-0834: The Windows 2000 telnet client attempts to perform NTLM authentication by default, which allows remote atta...

The Windows 2000 telnet client attempts to perform NTLM authentication by default, which allows remote attackers to capture and replay the NTLM challenge/response via a telnet:// URL that points to the malicious server, aka the "Windows 2000 Telnet Client NTLM Authentication" vulnerability.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 8, 2024, 05:28 UTC (UTC+00:00)

Security readout for executives and security teams

An old flaw in the Windows 2000 telnet client let a malicious website or link silently log the user into an attacker's server, handing over the encrypted Windows password challenge. Microsoft fixed this in bulletin MS00-067 in 2000. It only matters today if legacy Windows 2000 systems are still in use. Limited to legacy environments still running the Windows 2000 telnet client. Modern Windows versions are unaffected, but exposure persists in industrial, medical, or air-gapped systems that were never upgraded and can process telnet:// URLs from email, documents, or web pages. Low priority for modern estates; historical Windows 2000 issue addressed by MS00-067. Confirm no legacy Win2000 telnet clients remain in use. Mitigation focus: Apply Microsoft security bulletin MS00-067 to affected Windows 2000 systems.; Retire or isolate any remaining Windows 2000 hosts from untrusted networks.; Block outbound telnet (TCP/23) at the perimeter to prevent NTLM leakage..

Prepared: Jul 11, 2026, 23:58 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jan 22, 2001, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
win2k-telnet-ntlm-authentication(5242)CVE reference · vdb-entry, x_refsource_XF
MS00-067CVE reference · vendor-advisory, x_refsource_MS

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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