Advisory severityCritical9.9Vendor: HighVeeam

Critical [CVE-2026-21666 +5] Veeam Backup & Replication: vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.

This critical-severity Veeam advisory covers CVE-2026-21672 and CVE-2026-21666 and 4 more CVEs; related products: Veeam Backup & Replication.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 6 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.

CVE-2026-21672 Source published Mar 12, 2026Source updated Jun 17, 2026

VulniPulse record published Jul 12, 2026

CVE-2026-21666 CVE-2026-21667 CVE-2026-21668 CVE-2026-21672 CVE-2026-21708 CVE-2026-21709

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Summary

A vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Fixed versions

12.3.2.4465
12.3.2

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Mitigation

Upgrade to a fixed release: 12.3.2.4465, 12.3.2. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Veeam Knowledge Base — Security Advisoriesofficial
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://www.veeam.com/kb_rss; this link opens the Veeam advisory index instead of the raw feed document.
Veeam
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Veeam

Cross-references

Validate CVE metadata against the authoritative registries.

Official resources

Veeam Backup & Replication downloads (target: 12.3.2.4465 / 12.3.2)
Official documentation
This advisory names 12.3.2.4465 / 12.3.2 as the first fixed releases — official upgrade documentation for Veeam Backup & Replication.
VBR build numbers & versions (KB2680)
Knowledge base
Official build-number table — match your console's exact build against the fixed build before patching.
Veeam Knowledge Base (advisory source)
Official documentation
Canonical Veeam KB — the authoritative advisory text, affected builds and hotfixes.
Veeam Trust Center
Official documentation
Veeam's security and vulnerability-disclosure hub.

Discussion(0)

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