Anti-Virus Engine Malformed Archives Virus Detection Bypass

Two Secunia reports:

Kaspersky Anti-Virus Engine Malformed Archives Virus Detection Bypass, read here.
fRoGGz has reported a weakness in Kaspersky Anti-Virus scan engine, which can be exploited by malware to bypass certain scanning functionality.

AVG Anti-Virus Engine Malformed ARJ Archive Virus Detection Bypass, read here.
fRoGGz has discovered a weakness in AVG Anti-Virus scan engine, which can be exploited by malware to bypass certain scanning functionality.

And third report, this time related to Symantec:
Symantec Brightmail AntiSpam MIME Processing Denial of Service, read here.
Vulnerability has been reported in Brightmail AntiSpam, which potentially can be exploited by malicious people to cause a DoS (Denial of Service).

So, question is: Can we believe that important antivirus companies doing well?

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