CVE-2026-21666
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on...
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
- Record
CVE-2026-21666- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
EUVDEUVD-2026-11574
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
- Record
EUVD-2026-11574- CVSS 3.1
- 10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-ghcx-4q37-gcrf
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on...
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
- Record
GHSA-ghcx-4q37-gcrf- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
- Record
CVE-2026-21666- CVSS 3.1
- 9.9 Critical
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-21666 is a critical vulnerability (CVSS 10.0) in Veeam Backup And Replication, published March 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.29%, the 70th percentile. No source names a fixed version.