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CVE-2021-39227

30
FAUCET Score

CVE-2021-39227 is a critical prototype pollution vulnerability affecting ZRender versions prior to 5.2.1, a 2D graphics library used by Apache ECharts. This flaw, rated 9.8 CVSS (CRITICAL), allows unauthenticated remote attackers to achieve high impact on confidentiality, integrity, and availability due to its network-based attack vector and low attack complexity. While a proof-of-concept exists, there is no evidence of active exploitation, and no public exploit intelligence (Metasploit, Nuclei, ExploitDB) is available. Community discussion and media coverage are minimal, suggesting limited public awareness despite its severity.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.2.1CPE matchmatch criteria
cpe:2.3:a:baidu:zrender:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.2MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0139 is in the 56th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: zrenderFixed in: 5.2.1
npmpatch availablevia ghsa
Product: zrenderFixed in: 4.3.3

Vendor Advisories (1)

npmGHSA-fhv8-fx5f-7fxfmedium

Prototype Pollution in the merge and clone helper methods

Sep 20, 2021

References

github.com / ecomfe/zrender/pull/826
PatchThird Party Advisory
github.com / ecomfe/zrender/releases/tag/5.2.1
Release NotesThird Party Advisory
github.com / ecomfe/zrender/security/advisories/GHSA-fhv8-fx5f-7fxf
Third Party Advisory