How severe is CVE-2026-21667?

CVE-2026-21667 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21667?

CVE-2026-21667 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21667?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-21667 have an EU (EUVD) identifier?

Yes. CVE-2026-21667 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11576.

When was CVE-2026-21667 published?

CVE-2026-21667 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-21667

CVE-2026-21667 is a critical-severity vulnerability in Veeam Veeam Backup & Replication with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11576
Weakness: CWE-284
Affected product: Veeam Veeam Backup & Replication
Published: 2026-03-12
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-21667?: A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
How severe is CVE-2026-21667?: CVE-2026-21667 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21667?: CVE-2026-21667 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21667?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-21667 have an EU (EUVD) identifier?: Yes. CVE-2026-21667 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11576.
When was CVE-2026-21667 published?: CVE-2026-21667 was published on 2026-03-12 and last updated on 2026-06-17.

References

https://www.veeam.com/kb4830

Affected products (1)

cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*

More vulnerabilities in Veeam Veeam Backup & Replication

CVE-2026-21708 — Critical (CVSS 9.9): A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
CVE-2026-21669 — Critical (CVSS 9.9): A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
CVE-2026-21666 — Critical (CVSS 9.9): A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
CVE-2025-48983 — Critical (CVSS 9.9): A vulnerability in the Mount service of Veeam Backup & Replication, which allows for remote code execution (RCE) on the…
CVE-2024-40711 — Critical (CVSS 9.8): A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code…
CVE-2024-29849 — Critical (CVSS 9.8): Veeam Backup Enterprise Manager allows unauthenticated users to log in as any user to enterprise manager web interface.

All CVEs affecting Veeam Veeam Backup & Replication →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-50746 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi…
CVE-2026-46978 — Critical (CVSS 10.0): Vulnerability in the Oracle Solaris product of Oracle Systems (component: Remote Administration Daemon). The…
CVE-2026-35308 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Centralized Third Party Jars).…
CVE-2026-35307 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that…
CVE-2026-46695 — Critical (CVSS 10.0): Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers…
CVE-2026-46840 — Critical (CVSS 10.0): Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service). Supported versions that are affected are…

Browse all CWE-284 (Improper Access Control) vulnerabilities →