Threat Intelligence / CVE / CVE-2026-21708

CVE-2026-21708 — Veeam Backup and Replication

CVSS v3.1 9.9 (CRITICAL) · EPSS 1.1% (higher than 78.1% of all scored CVEs) · Priority 8.1/10 · Published 2026-03-12

As of 2026-03-12, CVE-2026-21708 is a CRITICAL-severity vulnerability in Veeam Backup and Replication, CVSS v3.1 9.9, EPSS 1.1% (78.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-21708, 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: 2026-03-12

What is CVE-2026-21708?

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

The record classifies CVE-2026-21708 under weakness class CWE-89. 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): 1.1% probability of exploitation in the next 30 days, higher than 78.1% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 8.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-03-12

Is CVE-2026-21708 being exploited?

It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.

Affected products and versions

Veeam: Backup and Replication

How to fix CVE-2026-21708

The record marks a vendor fix as available for CVE-2026-21708. No patch URL is recorded on this row, so the fixed version has to be read from the vendor advisory in the sources below.

Threat activity tracking CVE-2026-21708

1 tracked threat in the Threadlinqs corpus references CVE-2026-21708, either in the campaign’s CVE list or as an indicator on the campaign record.

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 · 2026-03-15

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-2026-21708 are available via the Threadlinqs MCP server (Purple tier). View plans →

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