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TI-2026-17449 Aliases CVE-2026-21666GHSA-ghcx-4q37-gcrf

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

Priority MEDIUM 45CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01288 70th percentileScored 2026-11-07
Fix Fixed Backup and Replication (Veeam): 12.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
VeeamBackup and Replication12.3.2 to before 12.3.212.3.2Patch availableCNA
  • Backup and Replication VendorVeeam Affected 12.3.2 to before 12.3.2 Fixed in 12.3.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*12.0.0.1402 to before 12.3.2.4465VulnerableVeeam
  • cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:* Versions 12.0.0.1402 to before 12.3.2.4465 Vulnerable ·Veeam

Remediation

  • Fix · CNA Backup and Replication (Veeam) Fixed in 12.3.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Veeam Backup and Replication 12.3.2

    3 records Highest priority Priority MEDIUM 3 MEDIUM

    Other records, highest priority first

    • TI-2026-17450 A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.Priority MEDIUM 45
    • TI-2026-17451 Protection mechanism failure in Veeam Backup and ReplicationPriority MEDIUM 41
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21666
  2. 2026-10-03 Alias added: GHSA-ghcx-4q37-gcrf

References

Advisory 1

  • TI-2024-27107 Deserialization of untrusted data in Veeam Backup and Recovery KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09844 Veeam Backup & Replication 10.x and 11.x has Incorrect Access Control (issue 1 of 2). KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09843 Improper limitation of path names in Veeam Backup & Replication 9.5U3, 9.5U4,10.x, and… KEVCVSS 3.1HIGH 8.8
  • TI-2023-12256 Missing authentication in Veeam Backup & Replication KEVCVSS 3.1HIGH 7.5
  • TI-2024-19623 Veeam Backup Enterprise Manager allows unauthenticated users to log in as any user to enterprise manager web interface. CVSS 3.0CRITICAL 9.8
  • TI-2025-16913 A vulnerability allowing remote code execution (RCE) on the Backup Server by an authenticated domain user CVSS 3.1HIGH 8.8
See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences