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5.0

UnityMail can be crashed by many email headers

CVE-1999-0925 · published 27 years ago
Summary

UnityMail may stop working if it receives an email that contains an unusually large number of MIME headers. This can cause a denial of service, interrupting email communication for users. Apply the vendor's update or configure the system to reject messages with excessive headers to prevent the issue.

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
messagemedia unitymail <= 2.0
cpe:2.3:a:messagemedia:unitymail:*:*:*:*:*:*:*:*
Original advisory text
UnityMail allows remote attackers to conduct a denial of service via a large number of MIME headers.
UnityMail allows remote attackers to conduct a denial of service via a large number of MIME headers.
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
5.0 Medium
Exploitation
2% chance of attack within 30 days
Timeline
Published3 Sep 1999
Updated29 Oct 2026
First seen29 Sep 2026
Sources
CVE-1999-0925 · NVD
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