CWE-124

• CWE ID
• 124

• CWE Name
• Buffer Underwrite ('Buffer Underflow')

• CWE Abstraction
• Base

• CWE structure
• Simple

• CWE Status
• Incomplete

The software writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.

This typically occurs when a pointer or its index is decremented to a position before the buffer, when pointer arithmetic results in a position before the beginning of the valid memory location, or when a negative index is used.