HOMEVULNERABILITIESCVE-2021-21243
CRITICAL

CVE-2021-21243

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

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-21243 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

onedev_project1 product(s)
onedev
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/theonedev/onedev/commit/9637fc8fa461c5777282a0021c3deb1e7a48f137
PATCHhttps://github.com/theonedev/onedev/commit/9637fc8fa461c5777282a0021c3deb1e7a48f137
ADVISORYhttps://github.com/theonedev/onedev/security/advisories/GHSA-9mmq-fm8c-q4fv
ADVISORYhttps://github.com/theonedev/onedev/security/advisories/GHSA-9mmq-fm8c-q4fv

All References (4)

→
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

Quick Facts

CVE IDCVE-2021-21243
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-74
CISA KEVNo
Affected1 vendor(s)
PublishedJan 15, 2021

Related CVEs (CWE-74)

CVE-2025-20265
10.0
CVE-2026-56699
10.0
CVE-2024-38366
10.0
CVE-2022-24760
10.0
CVE-2020-26282
10.0
CVE-2023-32314
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-21243 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2021-21243·NVD