Threat Intelligence / CVE / CVE-2026-21666

CVE-2026-21666

CVSS 9.9 (CRITICAL) · EPSS 0.3% · Priority 7.1/10 · Published 2026-03-12

As of 2026-03-31, CVE-2026-21666 is a CVSS 9.9 (CRITICAL-severity) vulnerability. EPSS exploitation probability 0.3%. Threadlinqs Intelligence tracks 1 threat exploiting it.

Last updated: 2026-03-31

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

CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-284

Threats tracking this CVE

Veeam Backup & Replication 8 Critical Vulnerabilities — Domain User to Backup Server RCE (CVE-2026-21666, CVE-2026-21667, CVE-2026-21669, CVE-2026-21708) — CRITICAL

References

https://www.veeam.com/kb4830

Full detection coverage & IOCs for threats exploiting CVE-2026-21666 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence

Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.