Is CVE-2021-21248 actively exploited?

No active exploitation of CVE-2021-21248 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21248 be exploited remotely?

Yes. CVE-2021-21248 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21248?

CVE-2021-21248 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-21248

CWE-74Published: January 15, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability involving the build endpoint parameters. InputSpec is used to define parameters of a Build spec. It does so by using dynamically generated Groovy classes. A user able to control job parameters can run arbitrary code on OneDev's server by injecting arbitrary Groovy code. The ultimate result is in the injection of a static constructor that will run arbitrary code. For a full example refer to the referenced GHSA. This issue was addressed in 4.0.3 by escaping special characters such as quote from user input.

NVD Source

Technical Analysis

CVE-2021-21248 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.