The Mozilla Foundation Security Advisory describes this issue as:A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash. Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network"s hosts as well as services running on the user"s local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR CVE-2021-23982 (CVE-2021-23984 (CVE-2021-23987