Multiple security issues were discovered in Netty, a Java NIO client/server framework, which could result in HTTP request smuggling, denial of service or information disclosure.
For the stable distribution (buster), these problems have been fixed in version 1:4.1.33-1+deb10u2.
We recommend that you upgrade your netty packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/