How severe is CVE-2021-27904?

CVE-2021-27904 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-27904 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27904?

CVE-2021-27904 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27904?

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

When was CVE-2021-27904 published?

CVE-2021-27904 was published on 2021-03-02 and last updated on 2026-06-22.

CVE-2021-27904

CVE-2021-27904 is a medium-severity vulnerability in Misp-project Misp with a CVSS 3.x base score of 5.5. 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 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Misp-project Misp
Published: 2021-03-02
Last modified: 2026-06-22

Description

An issue was discovered in app/Model/SharingGroupServer.php in MISP 2.4.139. In the implementation of Sharing Groups, the "all org" flag sometimes provided view access to unintended actors.

Frequently asked questions

What is CVE-2021-27904?: An issue was discovered in app/Model/SharingGroupServer.php in MISP 2.4.139. In the implementation of Sharing Groups, the "all org" flag sometimes provided view access to unintended actors.
How severe is CVE-2021-27904?: CVE-2021-27904 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-27904 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27904?: CVE-2021-27904 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27904?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27904 published?: CVE-2021-27904 was published on 2021-03-02 and last updated on 2026-06-22.

References

https://github.com/MISP/MISP/commit/ca13fee271ad126832c88896776f3050a6c06e64

Affected products (1)

cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*

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