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CVE-2026-21666

Veeam Backup & Replication remote code execution

9.9 CRITICALEPSS 1.15%
  1. Published12 Mar 2026

Description

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Veeam Backup & Replication≥ 12.0.0.1402 < 12.3.2.4465

Remediation

Fixed in
Veeam Backup & Replication≥ 12.3.2.4465
Patch & vendor advisories

References

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Frequently asked

Is CVE-2026-21666 being actively exploited?

CVE-2026-21666 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.15%.

How severe is CVE-2026-21666?

CVE-2026-21666 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 1.15% probability of exploitation.

Which products are affected by CVE-2026-21666?

Affected products include Veeam Backup & Replication.

How do I fix CVE-2026-21666?

Upgrade affected software to a fixed version, for example Veeam Backup & Replication 12.3.2.4465 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-21666 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.