*) Security: 1-byte memory overwrite might occur during DNS server
response processing if the “resolver” directive was used, allowing an
attacker who is able to forge UDP packets from the DNS server to
cause worker process crash or, potentially, arbitrary code execution
(CVE-2021-23017).
转自 https://nginx.org/en/CHANGES-1.20
更多 https://nginx.org/en/download.html