Fix (APAR): PH34048 Status: Fix Release: 9.0.5.7,9.0.5.6,9.0.5.5,9.0.5.4 Operating System: AIX,HP-UX,IBM i,Linux,Solaris,Windows,z/OS Supersedes Fixes: CMVC Defect: xxxxxx Byte size of APAR: 277132 Date: 2021-04-15 Abstract: XXE Injection Vulnerability in WebSphere Application Server (CVE-2021-20454 CVSS 8.2) Description/symptom of problem: PH34048 resolves the following problem: ERROR DESCRIPTION: XXE Injection Vulnerability in WebSphere Application Server (CVE-2021-20454 CVSS 8.2). LOCAL FIX: PROBLEM SUMMARY: XXE Injection Vulnerability in WebSphere Application Server (CVE-2021-20454 CVSS 8.2). PROBLEM CONCLUSION: Confidential for CVE-2021-20454. Directions to apply fix: Install Fix to all WebSphere installations unless special instructions are included below. Special Instructions: None NOTE: The user must: * Logged in with the same authority level when unpacking a fix, fix pack or refresh pack. * Be at V1.8.5 or newer of the Installation Manager. Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required. The IBM Information Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes. http://www.ibm.com/support/knowledgecenter/SSDV2W_1.8.5/com.ibm.cic.agent.ui.doc/helpindex_imic.html. Shutdown WebSphere Application Server before applying the iFixes. Restart WebSphere Application Server after applying the iFixes. Directions to remove fix: The IBM Information Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes. http://www.ibm.com/support/knowledgecenter/SSDV2W_1.8.5/com.ibm.cic.agent.ui.doc/helpindex_imic.html. Shutdown WebSphere Application Server before removing the iFixes. Restart WebSphere Application Server after removing the iFixes. Directions to re-apply fix: 1) Shutdown WebSphere Application Server. 2) Follow the Fix instructions to apply the fix. 3) Restart WebSphere Application Server. Additional Information: