CVE-2021-40186 json
DNN CMS Server-Side Request Forgery (SSRF)
published 2022-05-31 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27371
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
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.
Patch / fix
- DNNSoftware DNN Platform 9.11.0
Exploit prediction
1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- appcheck-ng.com https://appcheck-ng.com/dnn-cms-server-side-request-forgery-cve-2021-40186 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- DNNSoftware DNN Platform
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
appcheck-ng.com
/dnn-cms-server-side-request-forgery-cve-2021-40186
exploit, third-party-advisory
Sources
- CVE List CVE-2021-40186
- NVD CVE-2021-40186
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