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VulnerabilityCVE-2026-21708Published 2026-03-12

CVE-2026-21708 — Veeam Backup and Replication

critical

As of 2026-05-10, CVE-2026-21708 is a CRITICAL-severity vulnerability in Veeam Backup and Replication, CVSS v3.1 9.9, EPSS 1.1% (65.5th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-21708, most recently “Ransomware Targeting of Backup Infrastructure: Akira/Fog/Frag Exploiting Veeam CVE-2024-40711, Plus CVE-2025-23120 and March 2026 Backup & Replication Flaws (CVE-2026-21666/21667/21708)”.

CVSS v3.1
9.9/10Critical
EPSS
1.1%Higher than 65.5% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
2Campaigns referencing it
Priority
7.6/10Threadlinqs triage score
Published
Updated 2026-05-10
CVSS v3.1 9.9 (CRITICAL) · EPSS 1.1% (higher than 65.5% of all scored CVEs) · Priority 7.6/10 · Published 2026-03-12

Last updated:

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 234 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 65.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
7.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-03-12, last modified 2026-05-10

Is CVE-2026-21708 being exploited?

It currently carries a trending score of 26 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

2 tracked threats in the Threadlinqs corpus reference CVE-2026-21708, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on .

Other references