No exploitation reportedFix available

CVE-2021-4229

No exploitation reported by the sources we read.

Published2022-05-24
WeaknessCWE-829 · CWE-912

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

A vulnerability was found in ua-parser-js 0.7.29/0.8.0/1.0.0. It has been rated as critical. This issue affects the crypto mining component which introduces a backdoor. Upgrading to version 0.7.30, 0.8.1 and 1.0.1 is able to address this issue. It is recommended to upgrade the affected component.

Timeline

dates in UTC

2022-05-2416:15CVE 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-2021-4229?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-4229?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ua-parser-js project ua-parser-js

Branch	Affected	Fixed in	Source
0.7	= 0.7.29	no fix published	NVD
0.8	= 0.8.0	no fix published	NVD
1.0	= 1.0.0	no fix published	NVD

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

Fix

Advisories and patches

github.comPatch

Detection

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

Sources

CISA-ADPSSVC decisionnone2025-04-14
OpenCVESSVC decisionnone—
CNACVSS 3.15read 2026-10-23
NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.07.6read 2026-10-23
CNAweakness (CWE)CWE-912read 2026-10-23
NVDweakness (CWE)CWE-829read 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:R/S:U/C:H/I:H/A:H
Published: 2022-05-24
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-4229?

Is CVE-2021-4229 actively exploited?

Active exploitation of CVE-2021-4229 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-2021-4229?

CVE-2021-4229 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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