How severe is CVE-2021-40901?

CVE-2021-40901 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-40901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40901?

CVE-2021-40901 affects Scniro-validator Project Scniro-validator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40901?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-40901 published?

CVE-2021-40901 was published on 2022-06-27 and last updated on 2026-06-17.

CVE-2021-40901

CVE-2021-40901 is a high-severity vulnerability in Scniro-validator Project Scniro-validator with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1333
Affected product: Scniro-validator Project Scniro-validator
Published: 2022-06-27
Last modified: 2026-06-17

Description

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in scniro-validator v1.0.1 when validating crafted invalid emails.

Frequently asked questions

What is CVE-2021-40901?: A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in scniro-validator v1.0.1 when validating crafted invalid emails.
How severe is CVE-2021-40901?: CVE-2021-40901 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-40901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40901?: CVE-2021-40901 affects Scniro-validator Project Scniro-validator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40901 published?: CVE-2021-40901 was published on 2022-06-27 and last updated on 2026-06-17.

References

https://github.com/yetingli/SaveResults/blob/main/js/scniro-validator.js

Affected products (1)

cpe:2.3:a:scniro-validator_project:scniro-validator:1.0.1:*:*:*:*:node.js:*:*

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