VDB-350672 · CVE-2026-21668 · kb4830

Veeam Backup and Replication up to 12.3.1 authorization

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	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.
7.9	$0-$5k	0.13

Summaryinfo

A vulnerability classified as critical was found in Veeam Backup and Replication up to 12.3.1. This vulnerability affects unknown code. Such manipulation leads to Remote Privilege Escalation. This vulnerability is uniquely identified as CVE-2026-21668. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Veeam Backup and Replication up to 12.3.1 and classified as critical. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability allowing an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.

The advisory is shared for download at veeam.com. This vulnerability is handled as CVE-2026-21668 since 01/02/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available.

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 best quality of vulnerability data, you may have to visit VulDB.

Affected

Veeam Backup & Replication

Productinfo

Type

Backup Software

Vendor

Veeam

Name

Backup and Replication

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 6.5
NVD Vector: 🔒

CNA Base Score: 8.8
CNA Vector (hackerone): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

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-2026-21668 (🔒)
GCVE (CVE): GCVE-0-2026-21668
GCVE (VulDB): GCVE-100-350672
CERT Bund: WID-SEC-2026-0709 - Veeam Backup & Replication: Mehrere Schwachstellen

Entryinfo

Created: 03/12/2026 17:01
Updated: 03/31/2026 04:44
Changes: 03/12/2026 17:01 (64), 03/12/2026 18:52 (7), 03/17/2026 11:38 (1), 03/31/2026 04:44 (13)
Complete: 🔍
Cache ID: 216:200:103