How severe is CVE-2021-23204?

CVE-2021-23204 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-23204 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23204?

CVE-2021-23204 affects Gallagher Command Centre. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23204?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-23204 published?

CVE-2021-23204 was published on 2021-06-11 and last updated on 2026-06-17.

CVE-2021-23204

CVE-2021-23204 is a high-severity vulnerability in Gallagher Command Centre with a CVSS 3.x base score of 8.1. 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: High (CVSS 3.x base score 8.1)
CVSS v2: 4.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Gallagher Command Centre
Published: 2021-06-11
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is 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).
How severe is CVE-2021-23204?: CVE-2021-23204 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-23204 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23204?: CVE-2021-23204 affects Gallagher Command Centre. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23204?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-23204 published?: CVE-2021-23204 was published on 2021-06-11 and last updated on 2026-06-17.

References

https://security.gallagher.com/Security-Advisories/CVE-2021-23204

Affected products (1)

cpe:2.3:a:gallagher:command_centre:*:*:*:*:*:*:*:*

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