CVE-2021-21267
In before version 2.0.0, email address validation is vulnerable to a denial-of-service attack where some input (for example `a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.`) will freeze the program or web…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.09%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Schema-Inspector is an open-source tool to sanitize and validate JS objects (npm package schema-inspector). In before version 2.0.0, email address validation is vulnerable to a denial-of-service attack where some input (for example `a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.`) will freeze the program or web browser page executing the code. This affects any current schema-inspector users using any version to validate email addresses. Users who do not do email validation, and instead do other types of validation (like string min or max length, etc), are not affected. Users should upgrade to version 2.0.0, which uses a regex expression that isn't vulnerable to ReDoS.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.09% probability · 81th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-400
- Affected
- schema-inspector project/schema-inspector · netapp/e-series performance analyzer · netapp/oncommand insight
- Source
- security-advisories@github.com
EPSS 2.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://gist.github.com/mattwelke/b7f42424680a57b8161794ad1737cd8fExploit, Third Party Advisory
- https://github.com/schema-inspector/schema-inspector/security/advisories/GHSA-f38p-c2gq-4pmrExploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210528-0006/Third Party Advisory
- https://www.npmjs.com/package/schema-inspectorExploit, Third Party Advisory
- https://gist.github.com/mattwelke/b7f42424680a57b8161794ad1737cd8fExploit, Third Party Advisory
- https://github.com/schema-inspector/schema-inspector/security/advisories/GHSA-f38p-c2gq-4pmrExploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210528-0006/Third Party Advisory
- https://www.npmjs.com/package/schema-inspectorExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.