Veeam Backup & Replication up to 12.3.1.1139 Backup Server code injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Veeam Backup & Replication up to 12.3.1.1139 and classified as critical. This affects an unknown function of the component Backup Server. Executing a manipulation can lead to Remote Privilege Escalation. This vulnerability is handled as CVE-2025-23121. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Veeam Backup & Replication up to 12.3.1.1139. This vulnerability affects an unknown code of the component Backup Server. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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

The weakness was released by Watchtowr and CodeWhite as kb4743. The advisory is shared for download at veeam.com. This vulnerability was named CVE-2025-23121. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.

The vulnerability scanner Nessus provides a plugin with the ID 240159 (Veeam Backup and Replication 12.x < 12.3.2.3617 Multiple Vulnerabilities (June 2025) (KB4743)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 12.3.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (240159) and EUVD (EUVD-2025-18675). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.2
VulDB Meta Temp Score: 9.0

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔒

CNA Base Score: 9.9
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 240159
Nessus Name: Veeam Backup and Replication 12.x < 12.3.2.3617 Multiple Vulnerabilities (June 2025) (KB4743)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Backup & Replication 12.3.2

Timelineinfo

06/18/2025 Advisory disclosed
06/18/2025 +0 days VulDB entry created
07/15/2025 +27 days VulDB entry last update

Sourcesinfo

Advisory: kb4743
Researcher: Watchtowr, CodeWhite
Status: Confirmed

CVE: CVE-2025-23121 (🔒)
GCVE (CVE): GCVE-0-2025-23121
GCVE (VulDB): GCVE-100-313156
EUVD: 🔒

Entryinfo

Created: 06/18/2025 15:36
Updated: 07/15/2025 16:25
Changes: 06/18/2025 15:36 (54), 06/18/2025 23:35 (2), 06/19/2025 03:47 (1), 06/19/2025 11:01 (12), 06/23/2025 19:03 (1), 06/24/2025 02:38 (2), 07/15/2025 16:25 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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