How severe is CVE-2021-23140?

CVE-2021-23140 has a CVSS 3.x base score of 9.9, rated critical 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 low.

Is CVE-2021-23140 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-2021-23140?

CVE-2021-23140 affects Gallagher Command Centre. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23140?

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

When was CVE-2021-23140 published?

CVE-2021-23140 was published on 2021-06-11 and last updated on 2026-06-17.

CVE-2021-23140

CVE-2021-23140 is a critical-severity vulnerability in Gallagher Command Centre with a CVSS 3.x base score of 9.9. 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-285.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v2: 6.5
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Gallagher Command Centre
Published: 2021-06-11
Last modified: 2026-06-17

Description

Improper Authorization vulnerability in Gallagher Command Centre Server allows command line macros to be modified by an unauthorised Command Centre Operator. This issue affects: Gallagher Command Centre 8.40 versions prior to 8.40.1888 (MR3); 8.30 versions prior to 8.30.1359 (MR3); 8.20 versions prior to 8.20.1259 (MR5); version 8.10 and prior versions.

Frequently asked questions

What is CVE-2021-23140?: Improper Authorization vulnerability in Gallagher Command Centre Server allows command line macros to be modified by an unauthorised Command Centre Operator. This issue affects: Gallagher Command Centre 8.40 versions prior to 8.40.1888 (MR3); 8.30 versions prior to 8.30.1359 (MR3); 8.20 versions prior to 8.20.1259 (MR5); version 8.10 and prior versions.
How severe is CVE-2021-23140?: CVE-2021-23140 has a CVSS 3.x base score of 9.9, rated critical 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 low.
Is CVE-2021-23140 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-2021-23140?: CVE-2021-23140 affects Gallagher Command Centre. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-23140 published?: CVE-2021-23140 was published on 2021-06-11 and last updated on 2026-06-17.

References

https://security.gallagher.com/Security-Advisories/CVE-2021-23140

Affected products (1)

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

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