How severe is CVE-2021-40088?

CVE-2021-40088 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2021-40088 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40088?

CVE-2021-40088 affects Primekey Ejbca. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40088?

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

When was CVE-2021-40088 published?

CVE-2021-40088 was published on 2021-08-25 and last updated on 2026-06-17.

CVE-2021-40088

CVE-2021-40088 is a medium-severity vulnerability in Primekey Ejbca with a CVSS 3.x base score of 5.4. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 4.9
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Primekey Ejbca
Published: 2021-08-25
Last modified: 2026-06-17

Description

An issue was discovered in PrimeKey EJBCA before 7.6.0. CMP RA Mode can be configured to use a known client certificate to authenticate enrolling clients. The same RA client certificate is used for revocation requests as well. While enrollment enforces multi tenancy constraints (by verifying that the client certificate has access to the CA and Profiles being enrolled against), this check was not performed when authenticating revocation operations, allowing a known tenant to revoke a certificate belonging to another tenant.

Frequently asked questions

What is CVE-2021-40088?: An issue was discovered in PrimeKey EJBCA before 7.6.0. CMP RA Mode can be configured to use a known client certificate to authenticate enrolling clients. The same RA client certificate is used for revocation requests as well. While enrollment enforces multi tenancy constraints (by verifying that the client certificate has access to the CA and Profiles being enrolled against), this check was not performed when authenticating revocation operations, allowing a known tenant to revoke a certificate belonging to another tenant.
How severe is CVE-2021-40088?: CVE-2021-40088 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2021-40088 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40088?: CVE-2021-40088 affects Primekey Ejbca. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40088?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40088 published?: CVE-2021-40088 was published on 2021-08-25 and last updated on 2026-06-17.

References

https://support.primekey.com/news/posts/51

Affected products (1)

cpe:2.3:a:primekey:ejbca:*:*:*:*:enterprise:*:*:*

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