CVE-2021-22570: 
MySQL vulnerability analysis and mitigation

CVE-2021-22570 is a vulnerability in Protocol Buffers (protobuf) that was discovered in January 2022. The vulnerability occurs when a null character is present in a proto symbol, which leads to incorrect parsing and subsequently results in a null pointer dereference during the generation of error messages (CVE Details, Red Hat).

The vulnerability stems from incorrect parsing of a null character in the proto symbol. When such a symbol is encountered, it leads to an unchecked call into the proto file's name during the generation of the resulting error message. Since the symbol is incorrectly parsed, the file pointer becomes null, resulting in a null pointer dereference (GitHub Release).

The vulnerability can lead to a null pointer dereference which could result in application crashes, causing a denial of service condition in affected systems (Red Hat).

The recommended mitigation is to upgrade to protobuf version 3.15.0 or greater which contains the fix for this vulnerability. Various vendors have released patches for their affected products, including Red Hat Enterprise Linux, Fedora, and Debian systems (GitHub Release, Debian Advisory).