CVE-2021-21242

Name: CVE-2021-21242
Creator: NVD / NIST
Published: 2021-01-15T21:15:13.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 74.19%

Last modified Jun 17, 2026

CVE-2021-21242 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 74.19% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

74.19%

99.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Onedev Project	Onedev	< 4.0.3

References

https://github.com/theonedev/onedev/commit/f864053176c08f59ef2d97fea192ceca46a4d9bePatch, Third Party Advisory
https://github.com/theonedev/onedev/security/advisories/GHSA-5q3q-f373-2jv8Third Party Advisory
https://github.com/theonedev/onedev/commit/f864053176c08f59ef2d97fea192ceca46a4d9bePatch, Third Party Advisory
https://github.com/theonedev/onedev/security/advisories/GHSA-5q3q-f373-2jv8Third Party Advisory

Timeline

Published: Jan 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21242?

How severe is CVE-2021-21242?

CVE-2021-21242 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 74.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21242?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21242?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST