Veeam Backup and Replication up to 12.3.1 access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.0$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Veeam Backup and Replication up to 12.3.1. Affected by this vulnerability is an unknown functionality. The manipulation leads to Remote Privilege Escalation. This vulnerability is traded as CVE-2026-21666. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Veeam Backup and Replication up to 12.3.1. This issue affects an unknown code. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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

The advisory is shared at veeam.com. The identification of this vulnerability is CVE-2026-21666 since 01/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 12.3.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0709). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Veeam Backup & Replication

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 (hackerone): 🔒

CVSSv2info

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

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Backup and Replication 12.3.2

Timelineinfo

01/02/2026 CVE reserved
03/12/2026 +69 days Advisory disclosed
03/12/2026 +0 days VulDB entry created
03/31/2026 +19 days VulDB entry last update

Sourcesinfo

Advisory: kb4830
Status: Confirmed

CVE: CVE-2026-21666 (🔒)
GCVE (CVE): GCVE-0-2026-21666
GCVE (VulDB): GCVE-100-350669
CERT Bund: WID-SEC-2026-0709 - Veeam Backup & Replication: Mehrere Schwachstellen

Entryinfo

Created: 03/12/2026 17:00
Updated: 03/31/2026 04:44
Changes: 03/12/2026 17:00 (64), 03/12/2026 18:52 (7), 03/17/2026 10:31 (3), 03/31/2026 04:44 (11)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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