CVE-2021-23155
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper validation of the cloud certificate chain in Mobile Client allows man-in-the-middle attack to impersonate the legitimate Command Centre Server. This issue affects: Gallagher Command Centre Mobile Client for Android 8.60 versions prior to 8.60.065; version 8.50 and prior versions.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Gallagher Command Centre Mobile Client for Android fails to properly validate the certificate chain when establishing connections to the cloud-based Command Centre Server. An attacker positioned in the network path (MITM) can present a malicious certificate and successfully impersonate the legitimate server, potentially intercepting or manipulating communications between the mobile client and server.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 8.50>= 8.60, < 8.60.065CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Gallagher Command Centre Mobile Client for Android is installedCheck the device for the Gallagher Command Centre Mobile app - look for an app named 'Command Centre Mobile' or 'Gallagher Command Centre' in the Android application listAffected if The app is present on the device
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Determine the installed application versionAccess the Android device settings, navigate to Apps > Command Centre Mobile (or Gallagher Command Centre), then view the Version information under App InfoAffected if The version shown is <= 8.50 OR >= 8.60 but < 8.60.065
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Confirm the app is configured to connect to a Command Centre ServerOpen the Command Centre Mobile app and verify if it has been configured with a server connection profile or endpoint URL for a cloud-based Command Centre ServerAffected if The app has an active server connection configured pointing to a Command Centre Server
A user is affected if the Gallagher Command Centre Mobile Client for Android is installed with version 8.50 or earlier, or version 8.60 through 8.60.064, and the app is configured to connect to a Command Centre Server.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped8.60.065
Update the Gallagher Command Centre Mobile Client for Android to version 8.60.065 or later. For organizations still on version 8.50 or prior, plan an upgrade path to the patched version.
8.60.065 or later (for both 8.50 and prior, and 8.60.x branches)
- Check the current version of Gallagher Command Centre Mobile Client for Android installed on the device
- Navigate to the official Gallagher support portal or app store to obtain the update
- Upgrade to version 8.60.065 or later for users on 8.60.x branch
- For users on version 8.50 or prior, upgrade to version 8.60.065 or later which contains the fix
- Verify the upgrade was successful by checking the app version after installation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-23155 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-23155 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data