Security readout for executives and security teams
A very old flaw in the InterAccess TelnetD server for Windows NT let a remote attacker crash or take over the service by sending an overly long login name. The bug was disclosed in early 2000 and affects a niche telnet server. Modern environments rarely run this product, but any lingering install would be highly exposed on network-facing telnet ports. Exposure is limited to legacy Windows NT hosts still running InterAccess/Pragma TelnetD 4.0 with the telnet port reachable from untrusted networks. In 2026 this is a rare footprint, most likely on unmanaged legacy servers, OT jump hosts, or forgotten lab systems. Low priority for most 2026 environments because the affected product is obsolete, but any confirmed instance should be treated as urgent given remote code execution potential and the age of the platform. Mitigation focus: Identify any hosts still running InterAccess or Pragma Systems TelnetD and decommission or replace with SSH.; If retirement is not possible, block telnet (TCP/23 or custom port) at the network perimeter and restrict to trusted management VLANs.; Consult current Pragma Systems vendor guidance for supported versions or patches before any continued use..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2000-0166 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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
Products and packages named in the record
CWE details
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