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Vulnerability record · CVE-2004-2375 · published 31 December 2004

CVE-2004-2375: 1st class internet solutions 1st class mail server vulnerability

11st Class Internet Solutions · 1st Class Mail Server

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).

7.5 CVSS 2.0 High EPSS 5.9% · top 7.1%
7.5CVSS 2.0 base score
5.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References, 6 tagged exploit
16 Jun 2026Last modified by NVD

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).

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/11029 Vendor Advisory
http://securitytracker.com/id?1009279
http://www.digiti.be/jeffosz/advisories/1stclasspop3.txt ExploitVendor Advisory
http://www.osvdb.org/4129
http://www.securityfocus.com/bid/9794 Exploit
http://www.zone-h.org/advisories/read/id=4047 ExploitVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/15314
http://secunia.com/advisories/11029 Vendor Advisory
http://securitytracker.com/id?1009279
http://www.digiti.be/jeffosz/advisories/1stclasspop3.txt ExploitVendor Advisory
http://www.osvdb.org/4129
http://www.securityfocus.com/bid/9794 Exploit
http://www.zone-h.org/advisories/read/id=4047 ExploitVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/15314

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.0CVE-2004-24461st class internet solutions 1st class mail server vulnerabilityDirectory traversal vulnerability in 1st Class Mail Server 4.01 allows remote attackers to read arbitrary files via a ".." (dot dot) sequences in unk…EPSS 2.0%4.3CVE-2004-24471st class internet solutions 1st class mail server vulnerabilityCross-site scripting (XSS) vulnerability in 1st Class Mail Server 4.01 allows remote attackers to inject arbitrary web script or HTML via the Mailbox…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2004-2375), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.