Security readout for executives and security teams
Plain-English summary
A lower-privileged Gallagher Command Centre operator could change controller and hardware configuration beyond their assigned authority. For sites using affected versions, this is a business-risk issue because unauthorized configuration changes may affect security operations or device availability.
Executive priority
Treat as high priority where Command Centre manages important operational hardware. Schedule upgrade work promptly, review operator access, and check for unauthorized configuration changes before considering the risk closed.
Technical view
CVE-2021-23205 is a CWE-116 improper encoding or escaping flaw in Gallagher Command Centre Server. The CVSS 3.1 score is 8.1 with network attack vector, low complexity, low privileges required, no user interaction, and high integrity and availability impact.
Likely exposure
Exposure is limited to organizations running Gallagher Command Centre 8.40 before 8.40.1888 MR3, 8.30 before 8.30.1359 MR3, 8.20 before 8.20.1259 MR5, or 8.10 and prior versions, especially where operator accounts can reach the server.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not marked in KEV. The vulnerability requires a Command Centre Operator account, so the practical risk is strongest from compromised, misused, or overly broad operator access.
Researcher notes
This is a privilege-bound authorization impact caused by improper encoding or escaping. The stated impact is integrity and availability, not confidentiality. Evidence in the bundle identifies affected releases and fixed maintenance releases, but does not provide exploit details or compensating controls.
Mitigation direction
- Upgrade 8.40 deployments to 8.40.1888 MR3 or later.
- Upgrade 8.30 deployments to 8.30.1359 MR3 or later.
- Upgrade 8.20 deployments to 8.20.1259 MR5 or later.
- For 8.10 and prior, check Gallagher guidance for supported remediation.
- Restrict operator access to trusted users until remediation is complete.
- Audit controller and hardware configuration changes for unauthorized activity.
Validation and detection
- Inventory Gallagher Command Centre Server versions across all environments.
- Compare installed versions against the affected version ranges.
- Confirm operator roles cannot alter hardware beyond intended privileges after upgrade.
- Review logs for unexpected controller or hardware configuration changes.
- Verify remediation guidance directly against the Gallagher advisory.
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-116: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-23205 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
- High
- CVSS
- 8.1 (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:H
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:H2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://security.gallagher.com/Security-Advisories/CVE-2021-23205CVE 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 Encoding or Escaping of Output
Improper Encoding or Escaping of Output represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.