Remoting 2.5.3 is a last minute release for EAP 5.1 with a security fix, JBREM-1231 - "InvokerRegistry needs to have security checks for the setters". The security fix is the only substantive change from release 2.5.2.SP3:

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Release Notes - JBoss Remoting - Version 2.5.3 (Flounder)

Bug

• [JBREM-1231] - InvokerRegistry needs to have security checks for the setters

Release

• [JBREM-1233] - Release 2.5.3

Task

• [JBREM-1219] - Update remoting guide for "generalizeSocketException"
• [JBREM-1229] - Display recreated InvokerLocator when bind address is 0.0.0.0
• [JBREM-1232] - Assure version compatibility with earlier versions of Remoting

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Testing:

• Smoke test passes with 2.5.3.
• I can't run the entire test suite to completion with either 2.5.2.SP3 or 2.5.3 (a clustering test complains about a port in use), but I get essentially the same results for both releases.