CVE-1999-0284

highpriority · track · 44EPSS 0.115 · 96 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

3 exploits · functional

Likely / severe?

11.5% (96th) EPSS

CVSS 7.5 · high

Is it mine?

4 products

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-27

Denial of service to NT mail servers including Ipswitch, Mdaemon, and Exchange through a buffer overflow in the SMTP HELO command.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.5

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v2.06.8mediumAV:N/AC:L/Au:N/C:P/I:P/A:P/E:POCsecondary · CVSS-BT (t0sche)

The CWE weakness classes this flaw belongs to.

Public proof-of-concept and weaponised exploit code.

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
ibm lotus domino mail serverall versionsnvdUScpe:2.3:a:ibm:lotus_domino_mail_server:*:*:*:*:*:*:*:*
microsoft exchange server= 4.0nvdUScpe:2.3:a:microsoft:exchange_server:*:*:*:*:*:*:*:*
microsoft exchange server= 5.0nvdUScpe:2.3:a:microsoft:exchange_server:*:*:*:*:*:*:*:*

Other names and identifiers for this entity.

Which sources assert this record, and when.

published 1998-01-01modified 2026-06-16

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External citations — patches, advisories, analysis.

scry

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