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Veeam Backup & Replication 12.3.1 Release

Veeam released the new version of Backup and Replication software 12.3.1.1139, which includes new features and addresses major security vulnerabilities.

First is CVE-2025-23120 with the critical severity level (9.9 score) – A vulnerability allowing remote code execution (RCE) by authenticated domain users.

This vulnerability only affects domain-joined backup servers, which is against best practices, by the way.

This issue affects Veeam Backup & Replication 12.3.0.310 and all earlier v12 builds. Consider updating ASAP.

Now let’s move to the new features and fixes. I will not show everything, because the list is too big, but I will point out a few I really love.

Platform support:

VMware vSphere 9.0 readiness. The official support will be confirmed with the full testing of the GA build when it becomes available. This means that after vSphere 9.0 is out, it is better to wait for Veeam to officially support this release before upgrading the vSphere environment.

Nutanix AHV – Removed the experimental support designation for malware detection, guest file indexing, and application-aware processing, except database log file shipping, which will still be considered experimental.

Proxmox VE – Updated ProxmoxVE plug-in enables the usage of non-root users to register Proxmox, support for Open vSwitch (OVS) networking, Object Storage API (SOSAPI), Nested Pools for backup jobs scope, and brings further backup performance improvements.

Enhancements:

One I really love for vSphere is – Instant VM Recovery engine improvements deliver a 5x increased number of simultaneous instant VM recoveries: up to 1000 VMs per backup server and up to 200 VMs per vPowerNFS server.

TLS connection support for the PostgreSQL configuration database has been added for improved security when hosting the database on an external server.

New ISO-based update distribution reduces downtime by accelerating update installation and eliminates the additional disk space requirement on the backup server, which was previously needed for unpacking the update before its installation.

New REST API capabilities include changing existing password records, rescanning all backup repository types, downloading metadata for Unstructured Data backups, and performing backup deletion.

New PowerShell capabilities include connection to Veeam Vaults, querying, and restoring protected Microsoft Entra ID conditional access policies.

There are more than 40 additional features, enhancements, and resolved issues, make sure you read the corresponding KB.

In addition, consider updating ASAP if CVE-2025-23120 addresses your installation.

Veeam Backup for Nutanix AHV – Restoring Nutanix AHV Backup Proxy Configuration

This topic is related to the previous post when we were talking about connecting to the existing Nutanix AHV appliance, but what should we do if we completely lose it or we need to restore the previous configuration? – The answer is simple: we can restore its configuration from the backup.

In this article, we will look at how to restore Nutanix AHV Backup Proxy from the configuration backup.

Veeam Backup for Nutanix AHV – Connecting to the existing Nutanix AHV Backup Proxy

Did you know that you can connect the VBR Server to the existing Nutanix AHV Backup Proxy (Appliance) instead of deploying a new one in case it was removed from the backup infrastructure for some reason, or you just want to connect an appliance previously used by another backup server?

I never thought that I needed this feature until I reinstalled the Prism Central in my lab. After that, I had to remove the old PC instance from the Veeam Inventory, which requires removing the existing proxy from the configuration as well.

Next, I will provide a quick walkthrough on how to connect to the existing proxy.

Backing up Proxmox Virtual Environment (PVE) using Veeam Backup and Replication

In this article, we will cover how to connect PVE hosts to the Veeam infrastructure, back up PVE VMs, and restore them.

Let me remind you that previously I wrote about how to deploy Proxmox Virtual Environment 8 as a nested virtualization on VMware vSphere for testing. Read it, if you’re interested in it.

Veeam Backup & Replication 12.3 Release

Update: if you’re reading this article. Consider reading about 12.3.1.

The new release of Veeam Backup is out today. It includes:

Support for Windows Server 2025;
Application-aware processing, Guest file system indexing, Suspicious file system activity detection for Nutanix AHV;
Enchantments in database and enterprise applications support;
Cyber Resiliency Enhancements and new features including Indicators of Compromise and Veeam Threat Hunter;
And more and more enchantments and new features.

For more info, please, check out the What’s New document(17 pages for minor updates!) and Release notes.

Download the latest version here.

Using Veeam Hardened Repository ISO and creating Hardened Repository

Did you know about Veeam Managed Hardened Repository ISO? This is a Rocky-based Linux distro, which is already pre-hardened to comply with DISA STIG requirements. In addition, Veeam Hardened Repository ISO provides simplified installation and management; there is a text-based user interface that includes all the basic features needed to configure OS and use it as a Veeam Repository.

You can get more information about features, requirements, and limitations on the Veeam R&D Forum.

With the build 0.1.17, this ISO left the technical preview state and got the production-ready status, including Veeam Experimental Support, so you can consider putting it to use.

In this article we will look at how to deploy a server, using Veeam Hardened Repository ISO and how to create a hardened repository using this server.

Using Nutanix Prism Central Categories with Veeam Backup 12.2

Categories (in other systems they can be called labels or tags) are used to group entities based on a key-value pairing. For example, we can group a set of VMs and mark them as production environments and apply some policies, while another part of VMs will be marked as tests with a different type of policy applied.

With the release of Veeam Backup 12.2 and the added Prism Central integration, VBR is now aware of Prism Central Categories and can back up all VMs under the specified category in a backup job.

In this article, we will look at how to create a category in Prism Central, how to attach it to the VM, and, sure, how to use VBR with categories.

Veeam Backup 12.2 and Nutanix Prism Central integration

With the release of 12.2, Veeam introduced a new long-awaited feature: Nutanix Prism Central integration, which simplifies the management of large Nutanix clusters, managed by Prism Central instance.

In this article, we will look at how to connect the VBR Server to the Prism Central Instance and perform backup and recovery tasks.

Veeam Backup & Replication 12.2 Release

A new Veeam release brings us a lot of new features including:

Long awaited Proxmox VE Support!;
Integration with Nutanix Prism Central;
Support for backup and recovery for MongoDB;
Full vSphere 8.0 Update 3 support;
VeeamONE Proxmox VE, RedHat KVM, and Oracle KVM support;
And more more!

You can check the Release Notes for VBR here and for VeeamONE here.

Veeam Backup & Replication 12.1.2 Release

On May 21, Veeam Backup & Replication 12.1.2 has been released.

This update contains important security bug fixes for the Enterprise Manager, including CVE-2024-29849 with a score of 9.8 and CVE-2024-29850 with a score of 8.8.

Please note, that CVE-2024-29849 allows an unauthenticated attacker to log in to the Veeam Backup Enterprise Manager web interface as any user. So, consider to update ASAP.

In addition to the security bug fixes, there are many new improvements and features. I won’t post all of them here, but a few are interesting for me:

Improved VMware NBD (Network Transport Mode) transport mode performance by up to 2x;

AlmaLinux 9.3 and Rocky 9.3 are supported for use as Linux-based backup repositories and backup proxies;

VMware Cloud Director 10.4.1 and 10.4.1.1 support;

Veeam Agent for Linux 6.1.2.1781 – AlmaLinux 9.3 & 9.4, RHEL 9.4, Rocky 9.3 & 9.4, and Ubuntu 24.04 Linux distributions support.

In total, there are about 100 improvements and fixes. So even if you don’t use the Enterprise Manager, consider installing this update to add support for new systems’ versions and bug fixes.