Veeam Software Appliance up to 13.0.0 code injection

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.
8.0$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Veeam Software Appliance up to 13.0.0. This impacts an unknown function. Performing a manipulation results in privilege escalation. This vulnerability is reported as CVE-2026-21671. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Veeam Software Appliance up to 13.0.0. This affects some unknown functionality. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at veeam.com. This vulnerability is uniquely identified as CVE-2026-21671 since 01/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 303202 (Veeam Backup and Replication < 13.0.1.2067 Multiple Vulnerabilities (March 2026) (KB4738)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 13.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303202) and CERT Bund (WID-SEC-2026-0709). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Veeam Backup & Replication

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 8.0

VulDB Base Score: 7.2
VulDB Temp Score: 6.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (hackerone): 🔒

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: 303202
Nessus Name: Veeam Backup and Replication < 13.0.1.2067 Multiple Vulnerabilities (March 2026) (KB4738)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Software Appliance 13.0.1

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: kb4831
Status: Confirmed

CVE: CVE-2026-21671 (🔒)
GCVE (CVE): GCVE-0-2026-21671
GCVE (VulDB): GCVE-100-350667
CERT Bund: WID-SEC-2026-0709 - Veeam Backup &amp; Replication: Mehrere Schwachstellen

Entryinfo

Created: 03/12/2026 17:00
Updated: 03/31/2026 04:44
Changes: 03/12/2026 17:00 (62), 03/12/2026 17:01 (2), 03/12/2026 22:49 (7), 03/17/2026 11:38 (1), 03/23/2026 05:27 (2), 03/31/2026 04:44 (2)
Complete: 🔍
Cache ID: 216:3B6:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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