CVE-2021-21243

Name: CVE-2021-21243
Creator: NVD / NIST
Published: 2021-01-15T20:15:12.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 54.49%

Last modified Jun 17, 2026

CVE-2021-21243 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, a Kubernetes REST endpoint exposes two methods that deserialize untrusted data from the request body. EPSS estimates a 54.49% chance of exploitation in the next 30 days.

Description

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, a Kubernetes REST endpoint exposes two methods that deserialize untrusted data from the request body. These endpoints do not enforce any authentication or authorization checks. This issue may lead to pre-auth RCE. This issue was fixed in 4.0.3 by not using deserialization at KubernetesResource side.

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

54.49%

98.9th 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/9637fc8fa461c5777282a0021c3deb1e7a48f137Patch, Third Party Advisory
https://github.com/theonedev/onedev/security/advisories/GHSA-9mmq-fm8c-q4fvThird Party Advisory
https://github.com/theonedev/onedev/commit/9637fc8fa461c5777282a0021c3deb1e7a48f137Patch, Third Party Advisory
https://github.com/theonedev/onedev/security/advisories/GHSA-9mmq-fm8c-q4fvThird Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-21243?

How severe is CVE-2021-21243?

CVE-2021-21243 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 54.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21243?

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-2021-21243?

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

Scan your code now

Source: NVD / NIST