CVE-2025-33073
Windows SMB Client Elevation of Privilege Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft Windows SMB Client Improper Access Control Vulnerability.
- Added
- 20 Oct 2025
- Fix due (US federal)
- 10 Nov 2025
- Used by ransomware
- Not known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By microsoft
- 56 days later
· 56 days later
Published
- 4 months later
· 4 months later
Added to CISA KEV
Known exploited in the wild
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C |
| NVDNVD · Analyzed | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 82.8% · top 0.3% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
Affected products
Microsoft · Windows 10 Version 1507
- affected 10.0.10240.0 – < 10.0.10240.21034
Microsoft · Windows 10 Version 1607
- affected 10.0.14393.0 – < 10.0.14393.8148
Microsoft · Windows 10 Version 1809
- affected 10.0.17763.0 – < 10.0.17763.7434
Microsoft · Windows 10 Version 21H2
- affected 10.0.19044.0 – < 10.0.19044.5965
Microsoft · Windows 10 Version 22H2
- affected 10.0.19045.0 – < 10.0.19045.5965
Microsoft · Windows 11 version 22H2
- affected 10.0.22621.0 – < 10.0.22621.5472
Microsoft · Windows 11 version 22H3
- affected 10.0.22631.0 – < 10.0.22631.5472
Microsoft · Windows 11 Version 23H2
- affected 10.0.22631.0 – < 10.0.22631.5472
Microsoft · Windows 11 Version 24H2
- affected 10.0.26100.0 – < 10.0.26100.4349
Microsoft · Windows Server 2008 R2 Service Pack 1
- affected 6.1.7601.0 – < 6.1.7601.27769
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- affected 6.1.7601.0 – < 6.1.7601.27769
Microsoft · Windows Server 2008 Service Pack 2
- affected 6.0.6003.0 – < 6.0.6003.23351
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)
- affected 6.0.6003.0 – < 6.0.6003.23351
Microsoft · Windows Server 2012
- affected 6.2.9200.0 – < 6.2.9200.25522
Microsoft · Windows Server 2012 (Server Core installation)
- affected 6.2.9200.0 – < 6.2.9200.25522
Microsoft · Windows Server 2012 R2
- affected 6.3.9600.0 – < 6.3.9600.22620
Microsoft · Windows Server 2012 R2 (Server Core installation)
- affected 6.3.9600.0 – < 6.3.9600.22620
Microsoft · Windows Server 2016
- affected 10.0.14393.0 – < 10.0.14393.8148
Microsoft · Windows Server 2016 (Server Core installation)
- affected 10.0.14393.0 – < 10.0.14393.8148
Microsoft · Windows Server 2019
- affected 10.0.17763.0 – < 10.0.17763.7434
Microsoft · Windows Server 2019 (Server Core installation)
- affected 10.0.17763.0 – < 10.0.17763.7434
Microsoft · Windows Server 2022
- affected 10.0.20348.0 – < 10.0.20348.3807
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)
- affected 10.0.25398.0 – < 10.0.25398.1665
Microsoft · Windows Server 2025
- affected 10.0.26100.0 – < 10.0.26100.4349
Microsoft · Windows Server 2025 (Server Core installation)
- affected 10.0.26100.0 – < 10.0.26100.4349
References (4)
- Windows SMB Client Elevation of Privilege Vulnerability (opens in a new tab)vendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073 (opens in a new tab)government-resource
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-products (opens in a new tab)
- https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-33073)Record last updated .