No exploitation reportedFix available

CVE-2021-21244

Q: Is CVE-2021-21244 actively exploited?

Active exploitation of CVE-2021-21244 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-21244?

CVE-2021-21244 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-01-15
Fixed in4.0.3
WeaknessCWE-74 · CWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, There is a vulnerability that enabled pre-auth server side template injection via Bean validation message tampering. Full details in the reference GHSA. This issue was fixed in 4.0.3 by disabling validation interpolation completely.

Timeline

dates in UTC

2021-01-1520:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-21244?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-21244?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Onedev project onedev

Branch	Affected	Fixed in	Source
4.0	< 4.0.3	4.0.3	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Onedev project onedev to 4.0.3

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.110read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-74read 2026-10-23
NVDweakness (CWE)CWE-94read 2026-10-23
FIRST EPSSEPSS score1.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-01-15
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-21244?

Is CVE-2021-21244 actively exploited?

Active exploitation of CVE-2021-21244 has not been confirmed. Its EPSS score was 1.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21244?

CVE-2021-21244 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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