CVE-2025-64095

Critical

Published: 28 October 2025

Published

28 October 2025

Modified

03 November 2025

KEV Added

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Patch

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CVSS Score 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.2017 95.5th percentile

Risk Priority 32 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-64095 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Dnnsoftware Dotnetnuke. Its CVSS base score is 10.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 4.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-14 Permitted Actions Without Identification or Authentication good match

prevent

Limits permitted actions without identification or authentication, directly preventing unauthenticated file uploads and overwrites in the DNN HTML editor provider.

SI-10 Information Input Validation good match

prevent

Enforces validation of information inputs to block unrestricted uploads of dangerous file types that enable overwriting and potential XSS injection.

SI-2 Flaw Remediation good match

prevent

Remediates the specific flaw in DNN versions prior to 10.1.1 by applying security patches and verifying flaw correction.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1491.002 External Defacement Impact

An adversary may deface systems external to an organization in an attempt to deliver messaging, intimidate, or otherwise mislead an organization or users.

attack.mitre.org →

T1505.003 Web Shell Persistence

Adversaries may backdoor web servers with web shells to establish persistent access to systems.

attack.mitre.org →

Why these techniques?

Unauthenticated file upload vulnerability in public-facing CMS directly enables T1190 (exploit public-facing application), facilitates web shell deployment via malicious file upload (T1505.003), and explicitly supports website defacement (T1491.002).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to 10.1.1, the default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files. An unauthenticated user can upload and replace…

existing files allowing defacing a website and combined with other issue, injection XSS payloads. This vulnerability is fixed in 10.1.1.

Deeper analysisAI

CVE-2025-64095 is a critical vulnerability in DNN (formerly DotNetNuke), an open-source web content management platform (CMS) within the Microsoft ecosystem. In versions prior to 10.1.1, the default HTML editor provider allows unauthenticated file uploads, enabling images to overwrite existing files on the server. This issue, which maps to CWE-434 (Unrestricted Upload of File with Dangerous Type), carries a CVSS v3.1 base score of 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

An unauthenticated attacker can exploit this vulnerability over the network with low complexity and no user interaction required. By uploading malicious files, the attacker can replace existing ones, leading to website defacement. When combined with other vulnerabilities, this facilitates the injection of XSS payloads.

The vulnerability has been addressed in DNN version 10.1.1. Additional details on the issue and mitigation are available in the security advisory at https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-3m8r-w7xg-jqvw.