CVE-2021-21243Public exploitNetwork attack vector

Pre-auth code execution via REST deserialization

Published Jan 15, 2021 · Updated Aug 3, 2024

Unsafe deserialization in OneDev before 4.0.3 allows remote attackers to execute code through unauthenticated Kubernetes REST requests. The allocate-job-caches and report-job-caches methods pass raw request bodies to SerializationUtils.deserialize as CacheAllocationRequest or CacheInstance data. Network access to either endpoint is sufficient; successful gadget execution runs code in the OneDev server process and can compromise its data and host privileges.

CVSS severity9.8
Critical
EPSS probability54.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in OneDev before 4.0.3 allows remote attackers to execute code through unauthenticated Kubernetes REST requests. The allocate-job-caches and report-job-caches methods pass raw request bodies to SerializationUtils.deserialize as CacheAllocationRequest or CacheInstance data. Network access to either endpoint is sufficient; successful gadget execution runs code in the OneDev server process and can compromise its data and host privileges.

The record

CVE
CVE-2021-21243
Published
Jan 15, 2021
Updated
Aug 3, 2024
Vendor
OneDev Pty
Product
OneDev
Classifications
CWE-74, CWE-502, 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

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

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.

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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')
CWE-502Deserialization of Untrusted Data
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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