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7.5

Computalynx CMail POP3 server can be hijacked via long HELO

CVE-2001-0742 · published 25 years ago
Summary

The CMail POP3 mail server version 2.4.9 can be tricked into running unwanted code when it receives an unusually long HELO command. This could let an attacker take control of the server and access or disrupt email services. Update the server to a newer version or apply the vendor’s patch to stop the problem.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
computalynx cmail 2.4.9
cpe:2.3:a:computalynx:cmail:2.4.9:*:*:*:*:*:*:*
Original advisory text
Buffer overflow in Computalynx CMail POP3 mail server 2.4.9 allows remote attackers to run arbitrary code via a long HELO command.
Buffer overflow in Computalynx CMail POP3 mail server 2.4.9 allows remote attackers to run arbitrary code via a long HELO command.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
1% chance of attack within 30 days
Timeline
Published18 Oct 2001
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2001-0742 · NVD
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