Home/CVE/Microsoft Windows SMB Client Improper Access Control Vulnerability
CVE

CVE-2025-33073

Microsoft Windows SMB Client Improper Access Control Vulnerability

Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.

HIGH · CVSS 8.8 ⚠ CISA KEV EPSS 0.37158
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 3% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules4 YARA rules0
⬢

Required Remediation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

⬡

Weakness Classification

CWE-284Improper Access Control
▤

Affected Products & Versions

15
microsoft windows 10 1507< 10.0.10240.21034
microsoft windows 10 1607< 10.0.14393.8148
microsoft windows 10 1809< 10.0.17763.7434
microsoft windows 10 21h2< 10.0.19044.5965
microsoft windows 10 22h2< 10.0.19045.5965
microsoft windows 11 22h2< 10.0.22621.5472
microsoft windows 11 23h2< 10.0.22631.5472
microsoft windows 11 24h2< 10.0.26100.4270
⚠

Public Exploits & PoCs

1
remoteWindows 11 SMB Client - Privilege Escalation & Remote Code Execution (RCE)2025-06-15
◈

Sigma Hunt Rules

4
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
exacthighSuspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing - Network
exacthighSuspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing
exacthighAttempts of Kerberos Coercion Via DNS SPN Spoofing
exacthighPotential Kerberos Coercion by Spoofing SPNs via DNS Manipulation
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Jun 2025 · 05:23 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
cisaKEV-CVE-2025-33073
msrcCVE-2025-33073Elevation of Privilege
splunk-security-contentf79c5d7a-dd99-4263-93e1-49ace5634c82
splunk-security-content9029b575-6f6b-4ab1-b660-67b24b7e9c3d
splunk-security-contentd585e253-1859-4170-977d-09376c731f74
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.vicarius.io/vsociety/posts/cve-2025-33073-detection-script-improper-access-control-in-windows-smb-affects-microsoft-productsThird Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-productsMitigationThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073US Government Resource
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