Threat Intelligence / CVE / CVE-2026-21669

CVE-2026-21669 — Veeam Backup & Replication

CVSS v3.1 9.9 (CRITICAL) · EPSS 0.2% (higher than 48.9% of all scored CVEs) · Priority 6.9/10 · Published 2026-03-12

As of 2026-03-31, CVE-2026-21669 is a CRITICAL-severity vulnerability in Veeam Backup & Replication, CVSS v3.1 9.9, EPSS 0.2% (48.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-21669, most recently “Veeam Backup & Replication 8 Critical Vulnerabilities — Domain User to Backup Server RCE (CVE-2026-21666, CVE-2026-21667, CVE-2026-21669, CVE-2026-21708)”.

Last updated: 2026-03-31

What is CVE-2026-21669?

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

The record classifies CVE-2026-21669 under weakness class CWE-94. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 187 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.9 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS (FIRST)
0.2% probability of exploitation in the next 30 days, higher than 48.9% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-03-12, last modified 2026-03-31

Is CVE-2026-21669 being exploited?

It currently carries a trending score of 17 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-21669

The record marks a vendor fix as available for CVE-2026-21669. Vendor advisory: https://www.veeam.com/kb4831. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-21669

1 tracked threat in the Threadlinqs corpus references CVE-2026-21669, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from threadlinqs-intel and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-21669 are available via the Threadlinqs MCP server (Purple tier). View plans →

← all vulnerabilities · Markdown version · Threadlinqs Intelligence