&gt; I hope the folks at Juniper are checking their toolchains, build machines and repositories for signs of similar attack.<p>I hope they figure out who planted it there and that they change their hiring&#x2F;code review policies to make sure that such a thing can not happen again. Firewalls should be tamper-proof to the point where they simply refuse to operate at all if the code has been messed with after it leaves the premises, the absence of such tamper proofing is already a problem and should be taken quite serious.