How severe is CVE-2000-0399?

CVE-2000-0399 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2000-0399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0399?

CVE-2000-0399 primarily affects Alt-n Mdaemon. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-0399?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2000-0399 published?

CVE-2000-0399 was published on 2000-05-24 and last updated on 2026-06-16.

CVE-2000-0399

CVE-2000-0399 is a medium-severity vulnerability in Alt-n Mdaemon with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Alt-n Mdaemon
Published: 2000-05-24
Last modified: 2026-06-16

Description

Buffer overflow in MDaemon POP server allows remote attackers to cause a denial of service via a long user name.

Frequently asked questions

What is CVE-2000-0399?: Buffer overflow in MDaemon POP server allows remote attackers to cause a denial of service via a long user name.
How severe is CVE-2000-0399?: CVE-2000-0399 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2000-0399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0399?: CVE-2000-0399 primarily affects Alt-n Mdaemon. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-0399?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2000-0399 published?: CVE-2000-0399 was published on 2000-05-24 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:alt-n:mdaemon:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:alt-n:mdaemon:3.1_beta:*:*:*:*:*:*:*

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