How severe is CVE-2021-23566?

CVE-2021-23566 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-23566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23566?

CVE-2021-23566 affects Nanoid Project Nanoid. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23566?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-23566 published?

CVE-2021-23566 was published on 2022-01-14 and last updated on 2026-06-17.

CVE-2021-23566

CVE-2021-23566 is a medium-severity vulnerability in Nanoid Project Nanoid with a CVSS 3.x base score of 4.0. 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-704.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
CVSS v2: 2.1
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-704
Affected product: Nanoid Project Nanoid
Published: 2022-01-14
Last modified: 2026-06-17

Description

The package nanoid from 3.0.0 and before 3.1.31 are vulnerable to Information Exposure via the valueOf() function which allows to reproduce the last id generated.

Frequently asked questions

What is CVE-2021-23566?: The package nanoid from 3.0.0 and before 3.1.31 are vulnerable to Information Exposure via the valueOf() function which allows to reproduce the last id generated.
How severe is CVE-2021-23566?: CVE-2021-23566 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-23566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23566?: CVE-2021-23566 affects Nanoid Project Nanoid. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-23566 published?: CVE-2021-23566 was published on 2022-01-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nanoid_project:nanoid:*:*:*:*:*:node.js:*:*

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