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CVE-2021-3804

25
FAUCET Score

CVE-2021-3804 describes an Inefficient Regular Expression Complexity vulnerability affecting the taro product. With a CVSS score of 7.5 (HIGH), this vulnerability can be exploited remotely with low attack complexity, potentially leading to a denial of service. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the potential for a high impact denial of service warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.9CPE matchmatch criteria
cpe:2.3:a:taro:taro:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 46th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @tarojs/helperFixed in: 3.3.9

Vendor Advisories (1)

npmGHSA-468q-v4jj-485hhigh

Inefficient Regular Expression Complexity in taro

Sep 20, 2021

References

github.com / nervjs/taro/commit/acadb6c826ba57f2030a626f1de4f7b4608fcdb5
PatchThird Party Advisory
huntr.dev / bounties/0ebe85e6-cc85-42b8-957e-18d8df277414
ExploitIssue TrackingPatchThird Party Advisory