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## RabbitMQ 3.7.21
RabbitMQ `3.7.21` is a maintenance release that includes a patch for [CVE-2019-11287](https://pivotal.io/security/cve-2019-11287).
RabbitMQ `3.7.x` series is supported [through March 2020](https://www.rabbitmq.com/versions.html).
### Erlang/OTP Compatibility Notes
Per the new Erlang version support policy in effect starting with January 2019,
this release [**no longer supports Erlang/OTP 20.3**](https://groups.google.com/d/msg/rabbitmq-users/G4UJ9zbIYHs/qCeyjkjyCQAJ).
Make sure a [supported Erlang version](https://www.rabbitmq.com/which-erlang.html) is used before upgrading.
[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
what package repositories and tools can be used to provision latest patch versions of Erlang `21.3.x` and `22.x`.
### Compatibility Notes
#### Upgrading to Erlang 21.x or Later Versions
When upgrading to this release **and upgrading Erlang to 21.x or later** at the same time, extra care has to be taken.
Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later,
RabbitMQ **must be upgraded before Erlang**.
#### Upgrade Doc Guides and Change Log
See [3.7.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.0) upgrade
and compatibility notes first if upgrading from an earlier release.
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades
and [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
### Getting Help
Any questions about this release, upgrades or RabbitMQ in general are welcome on the
[RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
## Changes
### Core Server
#### Bug Fixes
* Avoid pattern expansion when logging connection closure reason.
This addresses [CVE-2019-11287](https://pivotal.io/security/cve-2019-11287).
GitHub issue: [rabbitmq/rabbitmq-server#2155](https://github.com/rabbitmq/rabbitmq-server/pull/2155)
### LDAP Plugin
#### Enhancements
* Errors were not propagated back to the client correctly in case of an LDAP server authentication failure.
GitHub issue: [rabbitmq/rabbitmq-auth-backend-ldap#116](https://github.com/rabbitmq/rabbitmq-auth-backend-ldap/issues/116)
### STOMP Plugin
#### Bug Fixes
* `stomp.hide_server` is now available in the new style configuration format.
GitHub issue: [rabbitmq/rabbitmq-stomp#140](https://github.com/rabbitmq/rabbitmq-stomp/issues/140)
### Web STOMP Plugin
#### Bug Fixes
* The plugin emitted a warning on start.
GitHub issue: [rabbitmq/rabbitmq-web-stomp#115](https://github.com/rabbitmq/rabbitmq-web-stomp/issues/115)
### Web MQTT Plugin
#### Bug Fixes
* The plugin emitted a warning on start.
GitHub issue: [rabbitmq/rabbitmq-web-mqtt#59](https://github.com/rabbitmq/rabbitmq-web-mqtt/issues/59)
### Event Exchange Plugin
#### Bug Fixes
* `event_exchange.vhost` is now available in the new style configuration format.
GitHub issue: [rabbitmq/rabbitmq-event-exchange#43](https://github.com/rabbitmq/rabbitmq-event-exchange/issues/43)
## Source code archives
**Warning**: The source code archive provided by GitHub only contains the source of the broker,
not the plugins or the client libraries. Please download the archive named `rabbitmq-server-3.7.21.tar.xz`.
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