Basically you just have a pointer: p1 -> [Object 1] And someone holds access to p1 even after you free p1, so now: p1 -> [Junk] The security flaw is when that m

Basically you just have a pointer: p1 -> [Object 1] And someone holds access to p1 even after you free p1, so now: p1 -> [Junk] The security flaw is when that memory is reclaimed for some use, so now: p1 -> [Object 2] And the malicious holder has free access to the properties of the new object.