Is CVE-2021-21250 actively exploited?

No active exploitation of CVE-2021-21250 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21250 be exploited remotely?

Yes. CVE-2021-21250 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21250?

CVE-2021-21250 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2021-21250

CWE-538Published: January 15, 2021· Updated: Jun 17, 2026

6.5

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 which may lead to arbitrary file read. When BuildSpec is provided in XML format, the spec is processed by XmlBuildSpecMigrator.migrate(buildSpecString); which processes the XML document without preventing the expansion of external entities. These entities can be configured to read arbitrary files from the file system and dump their contents in the final XML document to be migrated. If the files are dumped in properties included in the YAML file, it will be possible for an attacker to read them. If not, it is possible for an attacker to exfiltrate the contents of these files Out Of Band. This issue was addressed in 4.0.3 by ignoring ENTITY instructions in xml file.

NVD Source

Technical Analysis

CVE-2021-21250 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), with a CVSS base score of 6.5.