How severe is CVE-2021-23335?

CVE-2021-23335 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 high, integrity none, and availability none.

Is CVE-2021-23335 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23335?

CVE-2021-23335 affects Is-user-valid Project Is-user-valid. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23335?

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-2021-23335 published?

CVE-2021-23335 was published on 2021-02-11 and last updated on 2026-06-17.

CVE-2021-23335

CVE-2021-23335 is a high-severity vulnerability in Is-user-valid Project Is-user-valid 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-74.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Is-user-valid Project Is-user-valid
Published: 2021-02-11
Last modified: 2026-06-17

Description

All versions of package is-user-valid are vulnerable to LDAP Injection which can lead to either authentication bypass or information exposure.

Frequently asked questions

What is CVE-2021-23335?: All versions of package is-user-valid are vulnerable to LDAP Injection which can lead to either authentication bypass or information exposure.
How severe is CVE-2021-23335?: CVE-2021-23335 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 high, integrity none, and availability none.
Is CVE-2021-23335 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23335?: CVE-2021-23335 affects Is-user-valid Project Is-user-valid. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23335?: 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-2021-23335 published?: CVE-2021-23335 was published on 2021-02-11 and last updated on 2026-06-17.

References

https://snyk.io/vuln/SNYK-JS-ISUSERVALID-1056766

Affected products (1)

cpe:2.3:a:is-user-valid_project:is-user-valid:*:*:*:*:*:node.js:*:*

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