Security readout for executives and security teams
Plain-English summary
Gallagher’s Android Mobile Connect app could fail to properly validate a cloud certificate chain, allowing a man-in-the-middle attacker to impersonate the legitimate Command Centre Server. For affected deployments, this could expose sensitive communications and disrupt access-control operations.
Executive priority
Treat as high priority for sites using Gallagher mobile access-control workflows. The issue can undermine trust between mobile clients and the Command Centre Server, with high confidentiality and availability impact, but the available sources do not show known active exploitation.
Technical view
CVE-2021-23162 is a CWE-296 certificate validation flaw in Gallagher Command Centre Mobile Connect for Android. It affects version 15 before 15.04.040 and version 14 and earlier. CVSS 3.1 is 7.7 with network attack vector, high attack complexity, no privileges, and no user interaction.
Likely exposure
Likely exposed environments are those still running Gallagher Command Centre Mobile Connect for Android version 14 or earlier, or version 15 below 15.04.040. The source bundle does not evidence impact to other Gallagher products or non-Android clients.
Exploitation context
The sources describe a man-in-the-middle scenario where an attacker impersonates the legitimate Command Centre Server. The CVE is not listed as KEV in the bundle, and no cited source provided here confirms active exploitation.
Researcher notes
Focus validation on certificate chain handling and version exposure, not unsupported product assumptions. The CVSS vector indicates remote network reachability but high attack complexity. Evidence is limited to the CVE record and Gallagher advisory references in the bundle.
Mitigation direction
- Upgrade Android Mobile Connect to 15.04.040 or later where applicable.
- Inventory Gallagher Mobile Connect Android clients and remove unsupported version 14 or earlier builds.
- Review Gallagher’s advisory for product-specific upgrade and support guidance.
- Monitor access-control environments for unusual mobile client connection behavior.
Validation and detection
- Check Android Mobile Connect app versions across managed and unmanaged devices.
- Confirm no version 14 or earlier clients remain in production use.
- Confirm version 15 clients are at least 15.04.040.
- Review mobile device management records for stale Gallagher app installs.
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-296: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-23162 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
- 7.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/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:H/PR:N/UI:N/S:U/C:H/I:L/A:H2.25.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.7HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://security.gallagher.com/Security-Advisories/CVE-2021-23162CVE 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 Following of a Certificate's Chain of Trust
Improper Following of a Certificate's Chain of Trust represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.