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I bought an used IP security camera on eBay, I dont know who was the previous owner. I've always thought that we can't trust 100% any firmwares/OSes that were been installed or used by someone else. We can't tell if it has been altered with malware and or spywares. Is it a recommanded practice to reflash the stock firmware on the camera before use, according to the fact that most of these devices don't have SecureBoot ?

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    If you're thinking about putting an IP security camera accessible on the internet (even with secure u/p), I wouldn't unless you can show it's not horribly insecure. See my previous answer on IP security cameras: security.stackexchange.com/questions/79642/… Commented Nov 15, 2019 at 17:05
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    The odds of the last user installing malicious malware are much lower than the odds that the person who built it simply did a poor job building security into it. It's all about the risk analysis Commented Nov 15, 2019 at 17:41
  • The camera I installed isn't exposed on Internet, it only works on my local network. I'm still uncertain about if the previous owner could have installed a modified code with malwares and or spywares. Even if the camera is only used internally, it would still be possible for a skilled attacker to append some code that would let the camera send or receive commands from a remote server ?
    – pmbonneau
    Commented Nov 15, 2019 at 20:02

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