Read the docs
TI-2021-17360 Aliases CVE-2021-40186GHSA-7fc9-x7pv-7jmw

DNN CMS Server-Side Request Forgery (SSRF)

Priority LOW 35CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

The AppCheck research team identified a Server-Side Request Forgery (SSRF) vulnerability within the DNN CMS platform, formerly known as DotNetNuke. SSRF vulnerabilities allow the attacker to exploit the target system to make network requests on their behalf, allowing a range of possible attacks. In the most common scenario, the attacker exploits SSRF vulnerabilities to attack systems behind the firewall and access sensitive information from Cloud Provider metadata services.

Why it matters now

EPSS 0.0115 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed DNN Platform (DNNSoftware): 9.11.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
DotNetNuke (DNN)DNN Platform9.0 to before 9.11.09.11.0Patch availableCNA
  • DNN Platform VendorDotNetNuke (DNN) Affected 9.0 to before 9.11.0 Fixed in 9.11.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:dnnsoftware:dotnetnuke:*:*:*:*:*:*:*:*up to 9.10.2VulnerableDotNetNuke (DNN)
  • cpe:2.3:a:dnnsoftware:dotnetnuke:*:*:*:*:*:*:*:* Versions up to 9.10.2 Vulnerable ·DotNetNuke (DNN)

Remediation

  • Fix · CNA DNN Platform (DNNSoftware) Fixed in 9.11.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40186
  2. 2026-10-03 Alias added: GHSA-7fc9-x7pv-7jmw

References

Exploit 1

  • TI-2017-07201 Code injection in DotNetNuke CMS Fixed in 9.1.1 KEVCVSS 3.1HIGH 8.8
  • TI-2018-12944 DNN (aka DotNetNuke) 9.2 through 9.2.2 uses a weak encryption algorithm to protect input… KEVCVSS 3.1HIGH 7.5
  • TI-2018-11271 DNN (aka DotNetNuke) 9.2 through 9.2.1 uses a weak encryption algorithm to protect input parameters. KEVCVSS 3.1HIGH 7.5
  • TI-2015-02468 The installation wizard in DotNetNuke (DNN) before 7.4.1 allows remote attackers to… CVSS 3.0CRITICAL 9.8
  • TI-2025-39546 DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite CVSS 3.1CRITICAL 10.0
  • TI-2018-12945 DNN (aka DotNetNuke) 9.2 through 9.2.2 incorrectly converts encryption key source values… CVSS 3.1HIGH 7.5
See all 75 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences