There are several articles about "planting backdoors on network devices by vendors intentionally" , for example Hardware Vendor Offers Backdoor with Every Product.
They found backdoors that were made by the vendors. Also, they mentioned, that major network device companies put backdoors on devices to give support staff emergency access to devices. If they find a security vulnerability they want to be able to patch it easily without having to make the user download and install a fix.
Note that the backdoors I am considering is not the kind that Ed Snowden called a "government backdoors".
- Are these backdoors real?
- Are they necessary or do we need to patch it?
- Is it also a potential danger?