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CVE-2026-21708

Veeam Backup & Replication remote code execution

9.9 CRITICALEPSS 1.14%
  1. Published12 Mar 2026

Description

A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.

CVSS 3.1 breakdown

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

Affected products

Veeam Backup & Replication≥ 12.0.0.1402 < 12.3.2.4465.

Remediation

Fixed in
Veeam Backup & Replication≥ 12.3.2.4465.

References

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Frequently asked

Is CVE-2026-21708 being actively exploited?

CVE-2026-21708 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.14%.

How severe is CVE-2026-21708?

CVE-2026-21708 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 1.14% probability of exploitation.

Which products are affected by CVE-2026-21708?

Affected products include Veeam Backup & Replication.

How do I fix CVE-2026-21708?

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-2026-21708 against the real software inventory on every managed device, as each hourly inventory arrives. 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.