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Category:   Application (Security)  >   avast! Vendors:   ALWIL Software
avast! antivirus May Fail to Detect Certain Viruses
SecurityTracker Alert ID:  1013991
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 18 2005
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.6.623 and prior
Description:   Juha-Matti Laurio reported a vulnerability in avast! antivirus. Certain types of viruses may not be detected.

The antivirus software may not properly detect certain virus types. The specific virus types were not identified.

Windows NT 4.0 systems are affected.

The vendor disclosed this vulnerability. Juha-Matti Laurio advised us of this vulnerability.

Impact:   A virus may bypass the anti-virus detection.
Solution:   The vendor has issued a fixed version (4.6.652), available via the application's user interface or at:

Vendor URL: (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Windows (NT)

Message History:   None.

 Source Message Contents

Subject:  avast! 4 antivirus Unspecified Scan Evation Vulnerability

A new local type vulnerability was reported in avast! antivirus version 
4.6.623 and prior.

A bug causing lack of detection of certain virus types under Windows NT 
4.0 operating system platform was fixed in avast! version 4.x anti-virus 
This issue is due to a failure of the application to properly handle 
certain virus types files.
Detailed information of virus typed handled in this issue is not available.

Solution status:
Vendor patch

ALWIL Software avast! 4 Professional Edition
ALWIL Software avast! 4 Home Edition

The vulnerability has been reported in version 4.6.623 of Professional 
and Home Edition. Other versions may also be affected as well.

ALWIL Software

Vendor homepage:

Pruduct homepage:
avast! 4 Professional Edition
avast! 4 Home Edition

The vendor has issued a fixed version 4.6.652 available for download at or via internal application's user 

avast! 4.x Revision History:

avast! antivirus updates:

Reported by:
This information was provided by the vendor.

Best regards,
Juha-Matti Laurio
<juha-matti.laurio [at]>

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