[ssheth]

Yes ... the older Teslas have the MobilEye chipsets which use this technology. Many other cars use the same MobilEye chipsets today .. so potentially could be an issue in other cars as well.

Its likely now that this error was pointed out that Tesla may add some speed limit validation code to ensure a car doesn't speed up much when a speed limit jumps by more than 25% or something like that..

[seanmcdirmid]

It only works when this is the first sign TACC sees. If TACC was previously engaged and saw other signs previously, the exploit doesn’t work. I’m sure Tesla fixed this, but given the nature of the edge case, it wasn’t simply a matter of sanity checking.

[tjoff]

Why would it only work if it is the first sign?

[seanmcdirmid]

Maybe because they were probably already doing sanity checking, but the kind that relied on some previous context? That seems reasonable, I’m sure they’ve thought about this kind of attack before, missing an obscure edge case.