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7.5

mIRC 5.5 client can be tricked to write files elsewhere

CVE-1999-0399 · published 27 years ago
Summary

The mIRC 5.5 chat program does not properly check file names when using its DCC server feature. This lets an attacker place a malicious file in a different folder on the victim's computer, potentially running unwanted commands. Update to a newer version or apply the vendor's patch to fix 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
khaled_mardam-bey mirc 5.5
cpe:2.3:a:khaled_mardam-bey:mirc:5.5:*:*:*:*:*:*:*
Original advisory text
The DCC server command in the Mirc 5.5 client doesn't filter characters from file names properly, allowing remote attackers to place a malicious file in a different location, possibly allowing the ...
The DCC server command in the Mirc 5.5 client doesn't filter characters from file names properly, allowing remote attackers to place a malicious file in a different location, possibly allowing the attacker to execute commands.
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
3% chance of attack within 30 days
Timeline
Published1 Jan 1999
Updated30 Oct 2026
First seen29 Sep 2026
Sources
CVE-1999-0399 · NVD
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