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CWE - 457 : Use of Uninitialized Variable

CWE Definition http://cwe.mitre.org/data/definitions/457.html
Number of vulnerabilities: 7
Description The code uses a variable that has not been initialized, leading to unpredictable or unintended results.In some languages, such as C, an uninitialized variable contains contents of previously-used memory. An attacker can sometimes control or read these contents.
Background Details
Other Notes Before variables are initialized, they generally contain junk data of what was left in the memory that the variable takes up. This data is very rarely useful, and it is generally advised to pre-initialize variables or set them to their first values early. If one forgets -- in the C language -- to initialize, for example a char *, many of the simple string libraries may often return incorrect results as they expect the null termination to be at the end of a string.

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