LTS Still Vulnerable?

Does anyone know if the LTS firmware is still vulnerable to the HikVision backdoor? I have recently won some business with a customer who has a few sites still with LTS cameras. The firmware is out of date which leads me to believe it is vulnerable, but I can't find anything on their website that would say if it is. Contacting them yesterday was absolutely no help, the woman I talked to said I should be on the latest firmware but refused to acknowledge that there was any vulnerability so there would be nothing to fix. They have no release notes for the latest firmware on any products. Currently my customer is using, CMIP7442-M and CMIP7562F-E.

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