CVE-2021-23136Network attack vector

Authenticated macro overrides via improper authorization

Published Jun 11, 2021 · Updated Aug 3, 2024

Improper authorization in Gallagher Security Command Centre Server allows remote authenticated users to override macros beyond their privileges. The server accepts macro-override operations from an unprivileged Command Centre Operator, but Gallagher has not disclosed the faulty authorization check. Access requires an operator account, and sites that do not use macros are not impacted; successful abuse changes macro behavior beyond the assigned role.

CVSS severity6.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Gallagher Security Command Centre Server allows remote authenticated users to override macros beyond their privileges. The server accepts macro-override operations from an unprivileged Command Centre Operator, but Gallagher has not disclosed the faulty authorization check. Access requires an operator account, and sites that do not use macros are not impacted; successful abuse changes macro behavior beyond the assigned role.

The record

CVE
CVE-2021-23136
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Gallagher Security
Product
Command Centre
Classifications
CWE-285, T1565
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.20 <8.20.1259 (MR5)
  2. Affected versionversion=8.30 <8.30.1359 (MR3)
  3. Affected versionversion=8.40 <8.40.1888 (MR3)
  4. Affected versionversion=unspecified <=8.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gallagher Security · Command Centreversion=8.20 <8.20.1259 (MR5); version=8.30 <8.30.1359 (MR3); version=8.40 <8.40.1888 (MR3); version=unspecified <=8.10

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5Gallagher SecurityCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1565Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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