CVE-2021-21242: Onedev Project Onedev

Critical severity, CVSS 9.8. EPSS: 74.2% chance of exploitation in the next 30 days.

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability which can lead to pre-auth remote code execution. AttachmentUploadServlet deserializes untrusted data from the `Attachment-Support` header. This Servlet does not enforce any authentication or authorization checks. This issue may lead to pre-auth remote code execution. This issue was fixed in 4.0.3 by removing AttachmentUploadServlet and not using deserialization

Affected products

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

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