A vulnerability is not as damning if it wasn't intentionally inserted to be a backdoor. It being easily discoverable suggests that there was no intention to hid

A vulnerability is not as damning if it wasn't intentionally inserted to be a backdoor. It being easily discoverable suggests that there was no intention to hide it, and thus it was not intended to be a backdoor. If conversely the vulnerability was difficult to find externally, was publically unknown, and was seen being used for attacks, that would be suggestive of a deliberate backdoor, and far more damning.