Microsoft on Wednesday warned of three new security gaps in its software, including one "critical" Windows flaw that could allow a hacker to run unauthorized code on victims' PCs.
The most serious of the flaws is what is known as a buffer overrun vulnerability, which could allow an attacker to use an unchecked buffer to run their own executable code.
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Because the security hole can be exploited without any action on the part of the user, Microsoft described it as critical, the highest rating in the software maker's four-level system.
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