How severe is CVE-2000-0556?

CVE-2000-0556 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2000-0556 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-0556?

CVE-2000-0556 affects Computalynx Cmail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2000-0556?

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

When was CVE-2000-0556 published?

CVE-2000-0556 was published on 2000-06-05 and last updated on 2026-06-16.

CVE-2000-0556

CVE-2000-0556 is a medium-severity vulnerability in Computalynx Cmail 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: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Computalynx Cmail
Published: 2000-06-05
Last modified: 2026-06-16

Description

Buffer overflow in the web interface for Cmail 2.4.7 allows remote attackers to cause a denial of service by sending a large user name to the user dialog running on port 8002.

Frequently asked questions

What is CVE-2000-0556?: Buffer overflow in the web interface for Cmail 2.4.7 allows remote attackers to cause a denial of service by sending a large user name to the user dialog running on port 8002.
How severe is CVE-2000-0556?: CVE-2000-0556 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2000-0556 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0556?: CVE-2000-0556 affects Computalynx Cmail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2000-0556?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2000-0556 published?: CVE-2000-0556 was published on 2000-06-05 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:computalynx:cmail:2.4.7:*:*:*:*:*:*:*

More vulnerabilities in Computalynx Cmail

CVE-2000-0557 — Critical (CVSS 10.0): Buffer overflow in the web interface for Cmail 2.4.7 allows remote attackers to execute arbitrary commands via a long…
CVE-1999-1521 — Critical (CVSS 10.0): Computalynx CMail 2.4 and CMail 2.3 SP2 SMTP servers are vulnerable to a buffer overflow attack in the MAIL FROM…
CVE-2001-0742 — High (CVSS 7.5): Buffer overflow in Computalynx CMail POP3 mail server 2.4.9 allows remote attackers to run arbitrary code via a long…

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