CVE-2021-21247: Onedev Project Onedev

High severity, CVSS 8.8. EPSS: 1.5% chance of exploitation in the next 30 days.

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, the application's BasePage registers an AJAX event listener (`AbstractPostAjaxBehavior`) in all pages other than the login page. This listener decodes and deserializes the `data` query parameter. We can access this listener by submitting a POST request to any page. This issue may lead to `post-auth RCE` This endpoint is subject to authentication and, therefore, requires a valid user to carry on the attack. This issue was addressed in 4.0.3 by encrypting serialization payload with secrets only known to server.

Affected products

• Onedev Project Onedev: before 4.0.3 (fixed in 4.0.3)

Published 2021-01-15. Last modified 2026-06-17.