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9.1
CRITICAL CVSS 3.1
CVE-2026-21671
Veeam Backup & Replication HA Remote Code Execution (RCE) as Backup Administrator
Overview
Description

A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.

Details
INFO

Published Date :

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

Last Modified :

March 31, 2026, 1:17 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-21671 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]
Solution
Address RCE vulnerability by applying vendor patches and restricting Backup Administrator role access.
  • Apply the latest security patches provided by Veeam.
  • Restrict Backup Administrator role permissions where possible.
  • Review and audit all administrative access logs.
  • Consider disabling HA for affected components if feasible.
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-2026-21671.

URL Resource
https://www.veeam.com/kb4831 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-2026-21671 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-2026-21671 weaknesses.

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-2026-21671 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, 2 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, 2 days ago)
  • Daily CyberSecurity
Veeam Urgently Patches Critical 9.9 CVSS RCE Flaws in Backup Servers

Veeam has released a major security update for Veeam Backup & Replication to address a cluster of high-stakes vulnerabilities, including multiple Critical Remote Code Execution (RCE) flaws. These vuln ... Read more

Published Date: Mar 13, 2026 (3 weeks, 2 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-2026-21671 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.

  • Reanalysis by [email protected]

    Mar. 31, 2026

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:veeam:veeam_backup_&_replication:*:*:*:*:*:*:*:* versions up to (including) 13.0.1.1071 OR *cpe:2.3:a:veeam:veeam_backup_&_replication:*:*:*:*:*:*:*:* versions from (including) 13.0.0.496 up to (including) 13.0.1.1071
  • Initial Analysis by [email protected]

    Mar. 31, 2026

    Action Type Old Value New Value
    Added CWE CWE-94
    Added CPE Configuration OR *cpe:2.3:a:veeam:veeam_backup_&_replication:*:*:*:*:*:*:*:* versions up to (including) 13.0.1.1071
    Added Reference Type HackerOne: https://www.veeam.com/kb4831 Types: Vendor Advisory
  • New CVE Received by [email protected]

    Mar. 12, 2026

    Action Type Old Value New Value
    Added Description A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.
    Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
    Added Reference https://www.veeam.com/kb4831
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: 9.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact