What’s Vulnerable › Vulnerabilities

CVE-2021-40186: DNN CMS Server-Side Request Forgery (SSRF)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-02 · updated 2026-06-17
• Weakness: CWE-918

Description

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.

Affected products

• DotNetNuke CMS Fixed in 9.1.1: through 9.10.2

References

• https://appcheck-ng.com/dnn-cms-server-side-request-forgery-cve-2021-40186
• https://appcheck-ng.com/dnn-cms-server-side-request-forgery-cve-2021-40186

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