CVE-2021-20328

Name	CVE-2021-20328
Description	Specific versions of the Java driver that support client-side field level encryption (CSFLE) fail to perform correct host name verification on the KMS server’s certificate. This vulnerability in combination with a privileged network position active MITM attack could result in interception of traffic between the Java driver and the KMS service rendering Field Level Encryption ineffective. This issue was discovered during internal testing and affects all versions of the Java driver that support CSFLE. The Java async, Scala, and reactive streams drivers are not impacted. This vulnerability does not impact driver traffic payloads with CSFLE-supported key services originating from applications residing inside the AWS, GCP, and Azure network fabrics due to compensating controls in these environments. This issue does not impact driver workloads that don’t use Field Level Encryption.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mongo-java-driver (PTS)	jessie	2.12.4-1	vulnerable
	stretch	2.12.4-1	fixed
	sid, trixie, buster, bullseye, bookworm	3.6.3-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mongo-java-driver	source	jessie	(unfixed)	end-of-life
mongo-java-driver	source	(unstable)	(not affected)

Notes

- mongo-java-driver <not-affected> (Vulnerable code introduce later)
https://jira.mongodb.org/browse/JAVA-4017
Fixed by: https://github.com/mongodb/mongo-java-driver/commit/60d87d5a76645a331a77ccc45ef7c67aac88b234