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9.9
CRITICAL CVSS 3.1
CVE-2026-21667
Backup Server Domain User RCE
Overview
Description

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

Details
INFO

Published Date :

March 12, 2026, 3:16 p.m.

Last Modified :

March 31, 2026, 1:01 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-21667 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Veeam veeam_backup_\&_replication
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL [email protected]
CVSS 3.1 HIGH [email protected]
Solution
Patch the Backup Server to fix the RCE vulnerability for authenticated users.
  • Apply vendor patches to the Backup Server.
  • Restrict domain user access to the Backup Server.
  • Review Backup Server configurations for security.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-21667.

URL Resource
https://www.veeam.com/kb4830 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-21667 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-21667 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-21667 vulnerability anywhere in the article.

  • The Cyber Express
Veeam Fixes RCE Bugs in Critical Backup & Replication Platform

An important Veeam security patch to address multiple vulnerabilities in its Backup & Replication platform that potentially allowed attackers to execute malicious code remotely, has been released. The ... Read more

Published Date: Mar 13, 2026 (3 weeks, 3 days ago)
  • CybersecurityNews
Veeam Patches Multiple Critical RCE Vulnerabilities on Backup Server

Veeam Patches Vulnerabilities on Backup Server A critical security update has been released for Backup & Replication software to fix severe vulnerabilities that could allow attackers to execute remote ... Read more

Published Date: Mar 13, 2026 (3 weeks, 3 days ago)
  • The Hacker News
Veeam Patches 7 Critical Backup & Replication Flaws Allowing Remote Code Execution

Veeam has released security updates to address multiple critical vulnerabilities in its Backup & Replication software that, if successfully exploited, could result in remote code execution. The vulner ... Read more

Published Date: Mar 13, 2026 (3 weeks, 4 days ago)
  • Daily CyberSecurity
Total Takeover: Veeam Patches Critical 9.9 CVSS RCE Flaws in Backup & Replication 12.3.2

Veeam has released a major update to address a cluster of high-stakes vulnerabilities in Veeam Backup & Replication 12.3.2, including several Critical Remote Code Execution (RCE) flaws with near-perfe ... Read more

Published Date: Mar 13, 2026 (3 weeks, 4 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-21667 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Mar. 31, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CPE Configuration OR *cpe:2.3:a:veeam:veeam_backup_&_replication:*:*:*:*:*:*:*:* versions from (including) 12.0.0.1402 up to (excluding) 12.3.2.4465
    Added Reference Type HackerOne: https://www.veeam.com/kb4830 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Mar. 12, 2026

    Action Type Old Value New Value
    Added CWE CWE-284
  • New CVE Received by [email protected]

    Mar. 12, 2026

    Action Type Old Value New Value
    Added Description A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    Added Reference https://www.veeam.com/kb4830
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.9
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact