How severe is CVE-2021-4314?

CVE-2021-4314 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-4314 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4314?

CVE-2021-4314 affects Linuxfoundation Zowe Api Mediation Layer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4314?

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

When was CVE-2021-4314 published?

CVE-2021-4314 was published on 2023-01-18 and last updated on 2026-06-17.

CVE-2021-4314

CVE-2021-4314 is a medium-severity vulnerability in Linuxfoundation Zowe Api Mediation Layer with a CVSS 3.x base score of 5.3. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Linuxfoundation Zowe Api Mediation Layer
Published: 2023-01-18
Last modified: 2026-06-17

Description

It is possible to manipulate the JWT token without the knowledge of the JWT secret and authenticate without valid JWT token as any user. This is happening only in the situation when zOSMF doesn’t have the APAR PH12143 applied. This issue affects: 1.16 versions to 1.19. What happens is that the services using the ZAAS client or the API ML API to query will be deceived into believing the information in the JWT token is valid when it isn’t. It’s possible to use this to persuade the southbound service that different user is authenticated.

Frequently asked questions

What is CVE-2021-4314?: It is possible to manipulate the JWT token without the knowledge of the JWT secret and authenticate without valid JWT token as any user. This is happening only in the situation when zOSMF doesn’t have the APAR PH12143 applied. This issue affects: 1.16 versions to 1.19. What happens is that the services using the ZAAS client or the API ML API to query will be deceived into believing the information in the JWT token is valid when it isn’t. It’s possible to use this to persuade the southbound service that different user is authenticated.
How severe is CVE-2021-4314?: CVE-2021-4314 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-4314 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4314?: CVE-2021-4314 affects Linuxfoundation Zowe Api Mediation Layer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4314?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4314 published?: CVE-2021-4314 was published on 2023-01-18 and last updated on 2026-06-17.

References

https://github.com/zowe/api-layer/

Affected products (1)

cpe:2.3:a:linuxfoundation:zowe_api_mediation_layer:*:*:*:*:*:*:*:*

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