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CVE-2021-21267

25
FAUCET Score

CVE-2021-21267 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the Schema-Inspector npm package, affecting versions prior to 2.0.0. Specifically, malformed email addresses can cause the program or web browser to freeze, impacting any application using Schema-Inspector for email validation. With a CVSS score of 7.5 (High), this vulnerability is remotely exploitable with low attack complexity, leading to a high availability impact. There is currently no evidence of active exploitation, and no public exploit code or significant community discussion has been observed.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.0CPE matchmatch criteria
cpe:2.3:a:schema-inspector_project:schema-inspector:*:*:*:*:*:node.js:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.09%
Probability of exploitation in next 30 days
EPSS Percentile
79.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0209 is in the 64th 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 (1)

npmpatch availablevia ghsa
Product: schema-inspectorFixed in: 2.0.0

Vendor Advisories (1)

npmGHSA-f38p-c2gq-4pmrhigh

Regular Expression Denial-of-Service in npm schema-inspector

Mar 19, 2021

References

gist.github.com / mattwelke/b7f42424680a57b8161794ad1737cd8f
ExploitThird Party Advisory
github.com / schema-inspector/schema-inspector/security/advisories/GHSA-f38p-c2gq-4pmr
ExploitThird Party Advisory
security.netapp.com / advisory/ntap-20210528-0006
Third Party Advisory
npmjs.com / package/schema-inspector
ExploitThird Party Advisory