Security readout for executives and security teams
WinSMTP versions 1.06f and 2.X contain a flaw where sending an overly long USER or HELO command can crash the mail server, knocking it offline. The impact reported in public sources is denial of service against the SMTP service. This is a legacy Windows SMTP product from 2000 and is unlikely to appear in modern environments. Very low in modern estates. WinSMTP is an obsolete Windows SMTP product from ~2000; only legacy or archival systems still running it and exposing SMTP would be affected. Not on CISA KEV and no CVSS assigned. Low priority for modern environments. Only relevant if legacy WinSMTP is still running on internet-reachable systems, in which case the risk is service outage of that mail node rather than data compromise. Treat as hygiene and lifecycle management, not an incident. Mitigation focus: Inventory mail infrastructure for any WinSMTP 1.06f or 2.X instances still in use.; Retire or replace legacy WinSMTP with a currently supported SMTP server.; Restrict inbound SMTP (TCP/25) to trusted networks if WinSMTP must remain online..
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-2000-0833 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
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
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
- winsmtp-helo-bo(5255)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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