CVE-1999-0284

Exp

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

Published: 1998-01-01 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0284 is rated High Exploit Risk (75.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.37%). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-1999-0284

EDB-ID Source Kind Published Link
23146 exploit_db edb 1999-03-10 Exploit-DB ↗
23113 exploit_db edb 1998-03-10 Exploit-DB ↗
23145 exploit_db edb 1998-03-10 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-1999-0284

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-21 3.33% 3.37% +0.03%
2 2026-02-20 3.44% 3.33% -0.11%
3 2025-03-30 — 3.44% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0284

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-1999-0284

OS Trackers for CVE-1999-0284

vendor priority summary link
alpine — CVE-1999-0284: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-1999-0284

Affected software / configurations for CVE-1999-0284

Vendor Product Version Raw CPE
ibm lotus_domino_mail_server — cpe:2.3:a:ibm:lotus_domino_mail_server:*:*:*:*:*:*:*:*
microsoft exchange_server 4.0 cpe:2.3:a:microsoft:exchange_server:4.0:-:*:*:*:*:*:*
microsoft exchange_server 5.0 cpe:2.3:a:microsoft:exchange_server:5.0:-:*:*:*:*:*:*

References for CVE-1999-0284

cvelogic Threat Intelligence