How severe is CVE-2021-42087?

CVE-2021-42087 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-42087 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42087?

CVE-2021-42087 affects Zammad. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42087?

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

When was CVE-2021-42087 published?

CVE-2021-42087 was published on 2021-10-07 and last updated on 2026-06-17.

CVE-2021-42087

CVE-2021-42087 is a medium-severity vulnerability in Zammad with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zammad
Published: 2021-10-07
Last modified: 2026-06-17

Description

An issue was discovered in Zammad before 4.1.1. An admin can discover the application secret via the API.

Frequently asked questions

What is CVE-2021-42087?: An issue was discovered in Zammad before 4.1.1. An admin can discover the application secret via the API.
How severe is CVE-2021-42087?: CVE-2021-42087 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-42087 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42087?: CVE-2021-42087 affects Zammad. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42087?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42087 published?: CVE-2021-42087 was published on 2021-10-07 and last updated on 2026-06-17.

References

https://zammad.com/en/advisories/zaa-2021-15

Affected products (1)

cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*

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