How severe is CVE-2000-0990?

CVE-2000-0990 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2000-0990 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0990?

CVE-2000-0990 primarily affects Krzysztof Dabrowski Cmd5checkpw. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-0990?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2000-0990 published?

CVE-2000-0990 was published on 2000-12-19 and last updated on 2026-06-16.

CVE-2000-0990

CVE-2000-0990 is a high-severity vulnerability in Krzysztof Dabrowski Cmd5checkpw with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Krzysztof Dabrowski Cmd5checkpw
Published: 2000-12-19
Last modified: 2026-06-16

Description

cmd5checkpw 0.21 and earlier allows remote attackers to cause a denial of service via an "SMTP AUTH" command with an unknown username.

Frequently asked questions

What is CVE-2000-0990?: cmd5checkpw 0.21 and earlier allows remote attackers to cause a denial of service via an "SMTP AUTH" command with an unknown username.
How severe is CVE-2000-0990?: CVE-2000-0990 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2000-0990 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0990?: CVE-2000-0990 primarily affects Krzysztof Dabrowski Cmd5checkpw. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-0990?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2000-0990 published?: CVE-2000-0990 was published on 2000-12-19 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:krzysztof_dabrowski:cmd5checkpw:0.20:*:*:*:*:*:*:*
cpe:2.3:a:krzysztof_dabrowski:cmd5checkpw:0.21:*:*:*:*:*:*:*

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