The vulnerability occurs when AuthenticatedVoter.vote is called with a null Authentication parameter. The commit 5a7f12f1a9fdb4edaab6f61495f1d781a7273b61 addresses this by modifying the isFullyAuthenticated method, which is called by vote. The patch adds a null check for the authentication parameter in isFullyAuthenticated. Therefore, AuthenticatedVoter.vote is the public-facing vulnerable function as it's the one an application would call directly with the problematic null input, and AuthenticatedVoter.isFullyAuthenticated is the function that contained the specific logical flaw (missing null check) that led to the vulnerability. Both functions would appear in a runtime profile during the exploitation of this vulnerability. The changes in the test file AuthenticatedVoterTests.java further confirm that the vote method's behavior with a null Authentication was the scenario being fixed.