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Release Information for Veeam Backup & Replication 11a Cumulative Patches

KB ID: 4245
Product: Veeam Backup & Replication | 11
Published: 2021-11-26
Last Modified: 2023-09-26
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This update has been superseded by Veeam Backup & Replication 12.


Before installing this Cumulative Patch using the Patch Installer, please confirm that you are running Veeam Backup & Replication 11a (build with or without earlier patches. You can check the installed build number in the Veeam Backup & Replication Console's Main Menu (≡) under Help > About. After the upgrade, your build number will be P20230227.


If you are running any Veeam Backup & Replication version between 9.5 U4b ( and 11 ( P20210525), you must use the ISO below to upgrade to version 11a P20230227. Remember to review the Upgrade Checklist as part of your upgrade process.

Resolved Issues

This cumulative patch includes the following new features, enhancements and fixes for the original V11a builds:


  • Vulnerability (CVE-2023-27532) in Veeam Backup Service was fixed.
    This vulnerability was reported by Shanigen.



  • Microsoft Windows 11 and Microsoft Windows 10 21H2 support as guest OS, Hyper-V hosts (as a target for Instant Recovery and SureBackup), for installation of Veeam Backup & Replication components, and for agent-based backup with Veeam Agent for Microsoft Windows 5.0.2 (included in P20211211).
  • RHEL/CentOS/Oracle Linux 8.5, Ubuntu 21.10, Fedora 35 distributions are now supported as the guest OS for the installation of Veeam Backup & Replication components and for agent-based backup with Veeam Agent for Linux 5.0.2 (included in  P20211211). The latter also supports Linux kernel up to version 5.16 and no longer requires installing the linux-image-<version>-dbg package on Debian 11.
  • Oracle Database 21c support by application-aware processing of image-level backup including redo log backup, by Veeam Plug-in for Oracle RMAN (included in P20211211) and by Veeam Explorer for Oracle.
  • RHEL 8.4 for SAP Solutions and SLES 15 SP3 for SAP Applications support by Veeam Plug-in for SAP HANA.
  • VMware Carbon Black compatibility for vSphere VMs processing.
  • LTO-9 support. Tape jobs will now identify and display the media calibration process in the Action log and will no longer time out should this process takes longer than 15 minutes.
  • Platform: added API extensions enabling Kasten K10 integration and configuration backup/restore for upcoming versions of Veeam Backup for AWS/Azure/GCP; deleting cloud-native backup appliance will no longer delete the corresponding external repositories to facilitate configuration backup restore.
  • SOBR Capacity Tier: increased timeout for certain long-running object storage operations (like clean up) to 25 hours; fixed the root causes behind offload failures with “Block not found”, “The INSERT statement conflicted with the FOREIGN KEY constraint” and “No recovery record was found for storage key” errors.
  • Tape: fixed NDMP performance regression introduced in 11a; added support for Kasten K10 backups and backup copies to Backup to Tape jobs as well as support for restoring such backups from tape.
  • Microsoft Azure: region settings have been moved into the configuration file to allow for enabling Archive Tier functionality there as Microsoft rolls out the Archive Storage class to additional regions.
  • Microsoft Hyper-V: the presence of an empty SCVMM tag should no longer cause various issues in the related functionality; VMs from nested HostGroups should no longer be skipped from processing; application-aware processing failures on VMs with a very large number of network adapters.
  • VMware Cloud Director: the new plug-in version 11.1.7 adds support for: deployment with a very large number of organizations; LDAP-integrated users with multiple roles; installation side by side with other data protection plug-ins; browsers with the locale set to a language not present in the language picker.
  • Veeam Cloud Connect: evacuating backups of a particular tenant should no longer lock the entire SOBR extent preventing other tenants from accessing their backups; encrypted tenant backups should now be correctly unpublished following the restore from Archive Tier; tenants should again be presented with a choice of keeping or removing their replicas when removing cloud hosts.


  • Scale-out backup repository (SOBR): initiating SOBR rescan with one of Performance Tier extents being in maintenance mode, and taking said extent out of the maintenance mode at the specific moment of the Rescan process results in all backup files on this extent replaced with stubs downloaded from Capacity Tier.
  • SOBR Capacity Tier: under certain circumstances,  copy/offload to Capacity Tier starts failing with the “Attempt to overwrite existing non-sparse block version” error.
  • SOBR Archive Tier: a rare situation involving an interruption or a failure of the S3 API call to object storage during the specific operation may place Capacity Tier into a state resulting in further Archive Tier offload attempts failing with the “Specified key does not exist” error.
  • Email notifications: backup job email notifications are missing information about datastores with a lack of free disk space.
  • User interface: some UI nodes may show outdated job status information, requiring users to press F5 to refresh the view and actualize it.
  • HPE StoreOnce: updated HPE StoreOnce Catalyst library to version 4.2.4, which includes a fix from intermittent “Pipeline hanged” errors when reading data from the corresponding backup repository.

Known Issues

Please consider the following prior to installing the cumulative patch:
  • Veeam Agent for Linux: version 5.0.2 comes with veeamsnap kmod/kmp modules signed with a renewed certificate. Following the agent upgrade, you must update veeamsnap-ueficert package and enroll the new certificate to UEFI MOK, otherwise the module will fail to load. This applies only to RHEL/CentOS and SLES/openSUSE machines with UEFI SecureBoot enabled.
  • Veeam Cloud Connect: backup and backup copy jobs containing Windows 11 Hyper-V VMs and Kasten K10 backups will start failing for tenants if they install P20211211 before their service provider.



This update has been superseded by Veeam Backup & Replication 12.
If version 11a (11.0.1.x) is already installed, download and run the following patch on the Veeam Backup Server to update to the latest Cumulative Patch:

Filename: VeeamBackup&Replication_11.0.1.1261_20230227.zip
MD5: 6fb2cfbb3a17ea1ac4c949b2e868783a
SHA1: b21dc3125b09049e5aeaae2ec51e50ff44a50367

Note: If you were provided a hotfix by Veeam Support in the past year, this patch ( P20230227) may remove them. Consider upgrading to Veeam Backup & Replication 12 instead, or contact support for assistance.
For new installations and upgrades from previous versions, use the following ISO, which has the most recent Cumulative Patch built-in:
Reboot may be required

Please note that a reboot may be required after installing the update. 

Please plan accordingly.

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