Security readout for executives and security teams
Plain-English summary
A lower-privileged Gallagher Command Centre Operator could perform macro overrides they should not be authorized to perform. The issue mainly threatens integrity of access-control operations, not confidentiality or availability, based on the published CVSS vector.
Executive priority
Treat this as a moderate-priority operational control issue. It affects physical security administration integrity and should be remediated during the next controlled maintenance window, sooner for high-risk facilities or environments with many operator accounts.
Technical view
CVE-2021-23136 is an improper authorization flaw in Gallagher Command Centre Server. It is network-reachable, low complexity, requires low privileges, and needs no user interaction. The CVSS 3.1 score is 6.5, with high integrity impact and no stated confidentiality or availability impact.
Likely exposure
Organizations running Gallagher Command Centre 8.40 before 8.40.1888, 8.30 before 8.30.1359, 8.20 before 8.20.1259, or 8.10 and earlier may be exposed. Risk is most relevant where unprivileged Command Centre Operator accounts exist.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV in the supplied bundle. The vulnerability requires an authenticated, low-privileged operator, so insider misuse or compromised operator accounts are the main concern.
Researcher notes
The source bundle identifies CWE-285 and affected version thresholds but does not provide exploit details. Validation should focus on authorization boundaries around macro override behavior, version confirmation, and role configuration, without assuming broader product impact.
Mitigation direction
- Upgrade affected 8.40 deployments to 8.40.1888 MR3 or later.
- Upgrade affected 8.30 deployments to 8.30.1359 MR3 or later.
- Upgrade affected 8.20 deployments to 8.20.1259 MR5 or later.
- Check Gallagher guidance for 8.10 and earlier upgrade or support options.
- Review operator roles and restrict macro override privileges to authorized users.
Validation and detection
- Inventory Gallagher Command Centre Server versions across all sites.
- Confirm no deployment remains on the affected version ranges.
- Review operator accounts for unnecessary macro override capability.
- After remediation, verify unprivileged operators cannot perform macro overrides.
- Check logs for unexpected macro override activity by low-privileged operators.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-285: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-23136 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://security.gallagher.com/Security-Advisories/CVE-2021-23136CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.