How severe is CVE-2026-21708?

CVE-2026-21708 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 low.

Is CVE-2026-21708 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21708?

CVE-2026-21708 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21708?

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-2026-21708 have an EU (EUVD) identifier?

Yes. CVE-2026-21708 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11597.

When was CVE-2026-21708 published?

CVE-2026-21708 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-21708

CVE-2026-21708 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11597
Weakness: CWE-89
Affected product: Veeam Veeam Backup & Replication
Published: 2026-03-12
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-21708?: A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
How severe is CVE-2026-21708?: CVE-2026-21708 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 low.
Is CVE-2026-21708 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21708?: CVE-2026-21708 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21708?: 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-2026-21708 have an EU (EUVD) identifier?: Yes. CVE-2026-21708 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11597.
When was CVE-2026-21708 published?: CVE-2026-21708 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

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

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