CVE-2021-40186 DNN CMS Server-Side Request Forgery (SSRF)
Attackers can exploit SSRF in DNN CMS to make unauthorized network requests, potentially accessing internal systems or cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40186?
CVE-2021-40186 is a medium-severity server-side request forgery vulnerability in Dnnsoftware Dotnetnuke, published on 31 May 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2021-40186?
It affects 1 product.
Products include Dnnsoftware Dotnetnuke.
How do I fix CVE-2021-40186?
No fix has been published for CVE-2021-40186 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2021-40186 being exploited?
There is no known exploitation of CVE-2021-40186 in the wild and no public exploit code.
Other vulnerabilities in Dnnsoftware Dotnetnuke
- CVE-2017-9822 DotNetNuke (DNN) Remote Code Execution
- CVE-2018-15811 DotNetNuke (DNN) Inadequate Encryption Strength
- CVE-2018-18325 DotNetNuke (DNN) Inadequate Encryption Strength
- CVE-2025-64095 DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite
- CVE-2006-3601 Privilege escalation in n/a
Sources
Also known as GHSA-7fc9-x7pv-7jmw.