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Security Bulletin: Liberty for Java for IBM Cloud is vulnerable to spoofing due to Eclipse Paho (CVE-2019-11777)

Security Bulletin


There is a vulnerability in the Eclipse Paho library used by Liberty for Java for IBM Cloud with the rtcomm-1.0 or rtcommGateway-1.0 feature enabled. This has been addressed.

Vulnerability Details

CVEID:   CVE-2019-11777
DESCRIPTION:   Eclipse Paho Java client could allow a remote attacker to bypass security restrictions, caused by the failure to check the result when connecting to an MQTT server using TLS and setting a host name verifier. By sending a specially-crafted request, an attacker could exploit this vulnerability to allow one MQTT server to impersonate another and provide the client library with incorrect information.
CVSS Base score: 7.5
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)

Affected Products and Versions

These vulnerabilities affect all versions of Liberty for Java for IBM Cloud up to and including v3.72.


To upgrade to Liberty for Java for IBM Cloud v3.73-20220816-0814 or higher, you must re-stage or re-push your application.

To find the current version of Liberty for Java for IBM Cloud being used, from the command-line Cloud Foundry client by running the following commands:

cf ssh <appname> -c "cat staging_info.yml"

Look for similar lines:

{“detected_buildpack”:“Liberty for Java(TM) (WAR, liberty-xxx, 3.73-20220816-0814, xxx, env)“,”start_command”:“.liberty/initial_startup.rb”}

To re-stage your application using the command-line Cloud Foundry client, use the following command:

cf restage <appname>

To re-push your application using the command-line Cloud Foundry client, use the following command:

cf push <appname>

Workarounds and Mitigations


Get Notified about Future Security Bulletins



Change History

30 Aug 2022: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location


[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS4JBE","label":"Liberty for Java for IBM Cloud"},"Component":"","Platform":[{"code":"PF016","label":"Linux"}],"Version":"All","Edition":"","Line of Business":{"code":"LOB21","label":"Public Cloud Platform"}}]

Document Information

Modified date:
07 October 2022