CVE-2021-21244Public exploitNetwork attack vector

Pre-auth code execution via validation-message interpolation

Published Jan 15, 2021 · Updated Aug 3, 2024

Server-side template injection in OneDev before 4.0.3 allows remote attackers to execute arbitrary code through crafted REST query parameters. ValidQueryParamsValidator concatenates unexpected parameter names into buildConstraintViolationWithTemplate, letting Hibernate Validator interpret embedded EL. No account or user interaction is required, and successful exploitation grants code execution in the OneDev server process.

CVSS severity10.0
Critical
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in OneDev before 4.0.3 allows remote attackers to execute arbitrary code through crafted REST query parameters. ValidQueryParamsValidator concatenates unexpected parameter names into buildConstraintViolationWithTemplate, letting Hibernate Validator interpret embedded EL. No account or user interaction is required, and successful exploitation grants code execution in the OneDev server process.

The record

CVE
CVE-2021-21244
Published
Jan 15, 2021
Updated
Aug 3, 2024
Vendor
OneDev Pty
Product
OneDev
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OneDev Pty · OneDevversion=< 4.0.3

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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