Of course, Android 11 is still supported as of right now, so if you have been getting security updates when available, then you are good. I just know there are phones running 11 and below that don’t even get security updates, so those are the people that need to watch out. You can check your Security Patch Level in settings to be sure.
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There have been a few RCE’s for Android 11 and up impacting both Bluetooth and the Baseband.
Bluetooth:
https://www.malwarebytes.com/blog/news/2022/12/update-now-google-patches-android-vulnerability-that-allows-remote-code-execution-over-bluetooth
Baseband:
https://www.malwarebytes.com/blog/news/2023/03/update-android-now-two-critical-vulnerabilities-patched
Of course, Android 11 is still supported as of right now, so if you have been getting security updates when available, then you are good. I just know there are phones running 11 and below that don’t even get security updates, so those are the people that need to watch out. You can check your Security Patch Level in settings to be sure.