What is CVE-2021-23204?

CVE-2021-23204 is a high-severity vulnerability in Gallagher Command Centre, classified under Information Disclosure. CVSS score: 8.1/10. Published 2021-06-11.

How severe is CVE-2021-23204?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Gallagher Command Centre

CVE-2021-23204

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Gallagher Command Centre Server allows OSDP key material to be exposed to Command Centre Operators. This issue affects: Gallagher Command Centre 8.40 versions prior to 8.40.1888 (MR3); 8.30 versions prior to 8.30.1359 (MR3).

Vulnerability class: Information Disclosure

Published 2021-06-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.2th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Gallagher Command Centre — versions 8.40, 8.30
Gallagher Command Centre

Weakness classification (CWE)

References

security.gallagher.com/Security-Advisories/CVE-2021-23204 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-23204?: CVE-2021-23204 is a high-severity vulnerability in Gallagher Command Centre, classified under Information Disclosure. CVSS score: 8.1/10. Published 2021-06-11.
How severe is CVE-2021-23204?: High severity. CVSS v3 base score is 8.1 out of 10.