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CVE-2025-23120

KB ID:	4724
Product:	Veeam Backup & Replication \| 12 \| 12.1 \| 12.2 \| 12.3
Published:	2025-03-19
Last Modified:	2025-03-24

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Veeam Software Security Commitment

Veeam® is committed to ensuring its products protect customers from potential risks. As part of that commitment, we operate a Vulnerability Disclosure Program (VDP) for all Veeam products and perform extensive internal code audits. When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information. This approach ensures that all potentially affected customers can quickly implement the necessary measures to safeguard their systems. It’s important to note that once a vulnerability and its associated patch are disclosed, attackers will likely attempt to reverse-engineer the patch to exploit unpatched deployments of Veeam software. This reality underscores the critical importance of ensuring that all customers use the latest versions of our software and install all updates and patches without delay.

Issue Details

CVE-2025-23120

A vulnerability allowing remote code execution (RCE) on the Backup Server by an authenticated domain user.

Severity: Critical
CVSS v3.1 Score: 9.9AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: Reported by Piotr Bazydlo of watchTowr.

Note: This vulnerability only impacts domain-joined backup servers.

^{Veeam Backup & Replication Security Best Practice Guide > Workgroup or Domain?}

Affected Product

Veeam Backup & Replication 12.3.0.310 and all earlier version 12 builds.
_{Note: Unsupported product versions are not tested, but are likely affected and should be considered vulnerable.}

Solution

The vulnerability documented in this section was fixed starting in the following build:

Veeam Backup & Replication 12.3.1 (build 12.3.1.1139)

Upgrading to Veeam Backup & Replication 12.3.1 is the recommended way to mitigate this vulnerability. Please click the link above to review the Release Information for Veeam Backup & Replication 12.3.1, download links for the upgrade and update ISOs are provided in the above-linked KB article.

More Information

Vulnerability Hotfix for Veeam Backup & Replication 12.3

For existing deployments of Veeam Backup & Replication 12.3 (build 12.3.0.310), a hotfix to resolve this vulnerability has been developed and is intended for customers who cannot immediately update to version 12.3.1.

For deployments operating of Veeam Backup & Replication lower than 12.3.0.310, please upgrade directly to version 12.3.1.

Note: This hotfix can only be installed if Veeam Backup & Replication 12.3 has no other hotfixes installed, as it may overwrite earlier hotfixes. If other hotfixes for version 12.3 have been installed, the deployment must be updated to 12.3.1.

download hotfix for 12.3

^{This hotfix is only compatible with Veeam Backup & Replication 12.3 (build 12.3.0.310).}

Filename: VeeamBackup&Replication_12.3.0.310_KB4724.zip
MD5: 5185235DEA2AC9F2814638534B16A6DBSHA1: 4B1C3A7F2F051D958EAF363E2739B1B38C4A4F8C

This hotfix does not change the build number of the software. To validate that the hotfix has been deployed, compare the hash value of the files present on the system with the known hash value of the hotfix files.

Veeam.Backup.Common.dll — SHA1: F81B62807D82D9648733B1BF5AD70172B6CB19AA
Veeam.Backup.EsxManager.dll — SHA1: 9D72DD7E5CBE920454E7508AAF328CD1A59197E0

The following PowerShell commands can be used to check the SHA1 hash value of a given file.
_{Note: These commands check the dll in its default location, the path may need to adjusted if Veeam Backup & Replication was installed to a different drive or folder.}

Get-FileHash -Path 'C:\Program Files\Veeam\Backup and Replication\Backup\Veeam.Backup.Common.dll' -Algorithm SHA1
                
            

Get-FileHash -Path 'C:\Program Files\Veeam\Backup and Replication\Backup\Veeam.Backup.EsxManager.dll' -Algorithm SHA1
                
            

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