CVE-2026-21671

CRITICALNVD 9.19.1—

9.1

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 v3: 9.1
EG Score: 9.1(medium)
EPSS: 36.2%
KEV: Not listed

Published

March 12, 2026

Last Modified

May 10, 2026

Advisory Details (1)

Auto-updated May 10, 2026

No patch confirmed yet.

generic

KB4831: Vulnerabilities Resolved in Veeam Backup & Replication 13.0.1.2067

https://www.veeam.com/kb4831

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2026-21671?

CVE-2026-21671 is a critical vulnerability published on March 12, 2026. 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.

When was CVE-2026-21671 disclosed?

CVE-2026-21671 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on May 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21671 actively exploited?

CVE-2026-21671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21671?

CVE-2026-21671 has a CVSS v3 base score of 9.1 (NVD).

How do I remediate CVE-2026-21671?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21671, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-21671

📅 Published

🔄 Last Modified

📋 Advisory Details (1)