NTLM hash disclosure via post-validation Unicode normalization
Published Jun 21, 2025 · Updated Jun 23, 2025
Information disclosure in DNN Software DNN Platform 6.0.0 through 10.0.0 allows remote attackers to expose an NTLM hash via file upload. The pre-authentication DNNConnect.CKE FileUploader normalizes fullwidth Unicode after filename validation, turning the name into a rooted UNC path that Path.Combine passes to File.Exists. No account or user interaction is required; the resulting outbound SMB authentication sends a reusable credential response to an attacker-controlled server.
Summary
What happened
Information disclosure in DNN Software DNN Platform 6.0.0 through 10.0.0 allows remote attackers to expose an NTLM hash via file upload. The pre-authentication DNNConnect.CKE FileUploader normalizes fullwidth Unicode after filename validation, turning the name into a rooted UNC path that Path.Combine passes to File.Exists. No account or user interaction is required; the resulting outbound SMB authentication sends a reusable credential response to an attacker-controlled server.
The record
- CVE
- CVE-2025-52488
- Published
- Jun 21, 2025
- Updated
- Jun 23, 2025
- Vendor
- DNN Software
- Product
- DNN Platform
- Classifications
- CWE-200, T1187
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 21, 2025CVE publishedPublication date reported by the CVE source.
- Jun 23, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 6.0.0, < 10.0.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ProjectDiscovery Nuclei CVE-2025-52488 templatefunctional · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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