Anti-Virus softwares are vulnerable itself...

Approximately 800 vulnerabilities discovered in antivirus products
A recent ZDnet blog discusses a large number of vulnerabilities German research team N.Runs says it found in anti malware products from nearly every vendor. The ZDNet posting includes scary graphs to frighten users of security products.

If anti-virus softwares are vulnerable to security exploits then how someone can rely on anti-virus products? I guess, we soon need to look for anti-vulnerable software and then we might need anti-virus software.

Anti-virus companies should focus on overall security of their software rather then just increasing the prices for updating virus definitions and marketing of their products.

Please refer here for much more detail response on the subject by McAfee.