Is CVE-2021-23155 actively exploited?

No active exploitation of CVE-2021-23155 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-23155 be exploited remotely?

Yes. CVE-2021-23155 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-23155?

CVE-2021-23155 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2021-23155

CWE-296Published: November 18, 2021· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

Improper 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.

NVD Source

Technical Analysis

CVE-2021-23155 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.8.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.