In this blog post, we will be discussing the steps to upgrade Veeam Backup and Replication v12.3.x to 12.3.2. This update for 12.3.2 (Build 12.3.2.3617) was released June 17, 2024). Upgrading to the latest version of Veeam Backup & Replication ensures you stay protected with critical security fixes, gain access to new features, and benefit from improved stability and performance. Please, see How to upgrade Veeam Backup and Replication 12.3, and Upgrade Veeam Backup and Replication to version 12.2.

Below are some of the vulnerabilities that the 12.3.2 addresses. I will recommend taking a look at this KB article to see the vulnerabilities resolved in Veeam Backup & Replication 12.3.2. They are

CVE-2025-23121: Critical (CVSS 9.9): Remote code execution (RCE) by authenticated domain
CVE-2025-24286: High (CVSS 7.2): Authenticated Backup Operator could modify backup jobs to execute arbitrary code users on domain-joined backup servers.
CVE-2025-24287: Medium (CVSS 6.1): Local system users on Windows could modify directories to run arbitrary code; fixed in Veeam Agent for Microsoft Windows 6.3.2

In addition to vulnerabilities, please see the Release Information, and new features and enhancements for Veeam Backup & Replication 12.3. The release fixes these specific issues below:

Resolves errors in malware marking on German-localized SQL Server configuration DBs.
Fixes hangs in VMware vSphere application-aware processing and CDP proxy selection, plus issues during CDP failback.
Addresses delays and retention policy breakdowns in NAS and Tape jobs, problems with hardware encryption module updates, and orphan config entries in Tape jobs.
Fixes Cloud Connect cmdlet failure for tenants with multiple quotas

Also, see how to Set up Veeam Backup for Microsoft Azure, and how to uninstall Veeam Backup and Replication from your server. Here is how to “Upgrade VBR to 12.3.1: Setup detected inconsistent configuration“.

Fix Missing Updates for Veeam Backup and Replication

Interestingly, when new updates are available, the console actively prompts you with a notification about the missing updates, as shown below. You can then navigate to the URL in order to get more information and have the updater ISO downloaded.

You can download the updater ISO from here to update from 12.3.0 or 12.3.1 to 12.3.2. The following ISO can be downloaded here and for existing upgrades from older major versions like 11a, 12.0, 12.2. For a direct or new deployment, please use this link to get the ISO.

For me, I will be using the updater ISO as shown below from 12.3.1 to 12.3.2.

When you click on the updater ISO, you will be prompted to login with your credential in order to access the product downloads

As you can see, the updater ISO download is in progress.

Please, see How to update Veeam Backup and Replication [VBR], and how to Fix Error 1069: Windows could not start the Veeam backup service on local computer.

Determine the installed build number

You can check the installed build number in the Veeam Backup & Replication Console’s Main Menu (≡) under Help and then click on About.

As you can see below, we are currently running build:12.3.1.1139 and with the updater ISO. We can perform an update from 12.3.x to 12.3.2

Please, see Install Veeam ONE and Add VBR: Fix failed to connect to VBR, and

Applying VBR updates 12.3.2

Assess your deployment carefully as mentioned above. If you are running version 12.3.0 or 12.3.1, use the Updater ISO for a smoother upgrade. Finally, back up your configuration, stop all jobs and services, and review Veeam’s Before You Begin checklist.

Remember to unblock the security flag on the ISO file, since Windows automatically blocks files downloaded from the internet for security reasons.

Right-click to mount the ISO as shown below.

Double click on the mounted ISO and click on setup

Run the update now as shown below.

Next, click on Upgrade Veeam Backup and Replication.

Upon initialising the setup, please accept the license agreement.

It performs some configuration checks etc as shown below. When complete, click on Next

As you can see below, the following products will be upgraded. Do not forget to check the button to also automatically update remote components automatically and click next.

As you can see, the upgrade process has started.

Upgrading the console

Veeam Explorers are being upgraded

In this stage of the upgrade, Veeam upgrades the Agent redistributables to ensure all backup agents and their required components are updated for compatibility, stability, and support of the new Veeam Backup & Replication version.