How serious is CVE-2026-21671?

This vulnerability has a CVSS score of 9.1 out of 10, classified as CRITICAL severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-21671?

Yes, proof-of-concept exploit code for CVE-2026-21671 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-21671?

Check the official CVE details for a complete list of affected products and versions.

How do I fix CVE-2026-21671?

To remediate CVE-2026-21671, check for security patches from the vendor. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-21671

Critical

|9.1

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows an attacker with the Backup Administrator role to run malicious code remotely on systems using Veeam Backup & Replication in high availability setups. The attacker must already have authenticated access to the system, which makes it critical to limit who can hold that role.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$6,000($5K-$15K)

Vendor Response

Grade APatched in 0 days

Quick Information

Published

Mar 12, 2026

26 days ago

Last Modified

Mar 12, 2026

26 days ago