What is CVE-2021-27904?

CVE-2021-27904 is a medium-severity vulnerability in Misp. CVSS score: 5.5/10. Published 2021-03-02.

How severe is CVE-2021-27904?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Misp

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.

Published 2021-03-02 · last modified 2026-06-22.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (19.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

References

github.com/MISP/MISP/commit/ca13fee271ad126832c88896776f3050a6c06e64 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27904?: CVE-2021-27904 is a medium-severity vulnerability in Misp. CVSS score: 5.5/10. Published 2021-03-02.
How severe is CVE-2021-27904?: Medium severity. CVSS v3 base score is 5.5 out of 10.