A remote buffer overflow vulnerability in Windows Workstation Service has been rated the biggest risk for computer users during November, from among vulnerabilities discovered or announced during the month.

The ratings were issued by anti-virus vendor and security services provider Symantec. Windows vulnerabilities occupied seven of the 10 rankings.

The company said it had used the following criteria to classify the bugs:

• Vulnerabilities with an impact rating of moderate-high to high. Impact is a numeric rating Symantec Security Response experts assign with values ranging from 1-10 representing the impact of the vulnerability on the confidentiality, integrity and availability of the affected system.
• Vulnerabilities that are remotely exploitable.
• Vulnerabilities affecting widely deployed and well-known technologies.
• Potential for hackers to exploit as part of a blended threats.

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