How severe is CVE-2021-27884?

CVE-2021-27884 has a CVSS 3.x base score of 5.1, 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 low, and availability none.

Is CVE-2021-27884 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27884?

CVE-2021-27884 affects Ymfe Yapi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27884?

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

When was CVE-2021-27884 published?

CVE-2021-27884 was published on 2021-03-01 and last updated on 2026-06-17.

CVE-2021-27884

CVE-2021-27884 is a medium-severity vulnerability in Ymfe Yapi with a CVSS 3.x base score of 5.1. 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-330.

Key facts

Severity: Medium (CVSS 3.x base score 5.1)
CVSS v2: 3.6
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-330
Affected product: Ymfe Yapi
Published: 2021-03-01
Last modified: 2026-06-17

Description

Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.

Frequently asked questions

What is CVE-2021-27884?: Weak JSON Web Token (JWT) signing secret generation in YMFE YApi through 1.9.2 allows recreation of other users' JWT tokens. This occurs because Math.random in Node.js is used.
How severe is CVE-2021-27884?: CVE-2021-27884 has a CVSS 3.x base score of 5.1, 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 low, and availability none.
Is CVE-2021-27884 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27884?: CVE-2021-27884 affects Ymfe Yapi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27884?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27884 published?: CVE-2021-27884 was published on 2021-03-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ymfe:yapi:*:*:*:*:*:*:*:*

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