How severe is CVE-2004-2375?

CVE-2004-2375 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2004-2375 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-2375?

CVE-2004-2375 affects 1st Class Internet Solutions 1st Class Mail Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-2375?

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-2004-2375 published?

CVE-2004-2375 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-2375

CVE-2004-2375 is a high-severity vulnerability in 1st Class Internet Solutions 1st Class Mail Server 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: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: 1st Class Internet Solutions 1st Class Mail Server
Published: 2004-12-31
Last modified: 2026-06-16

Description

Buffer overflow in the POP3 server in 1st Class Mail Server 4.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an APOP USER command with a long second parameter (digest).

Frequently asked questions

What is CVE-2004-2375?: Buffer overflow in the POP3 server in 1st Class Mail Server 4.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an APOP USER command with a long second parameter (digest).
How severe is CVE-2004-2375?: CVE-2004-2375 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-2375 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-2375?: CVE-2004-2375 affects 1st Class Internet Solutions 1st Class Mail Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-2375?: 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-2004-2375 published?: CVE-2004-2375 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:1st_class_internet_solutions:1st_class_mail_server:4.0:*:*:*:*:*:*:*