CVE-2021-23155

Name: CVE-2021-23155
Creator: NVD / NIST
Published: 2021-11-18T18:15:08.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2021-23155 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

0.47%

36.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gallagher	Command Centre Mobile Client	<= 8.50
Gallagher	Command Centre Mobile Client	>= 8.60, < 8.60.065

References

https://security.gallagher.com/Security-Advisories/CVE-2021-23155Vendor Advisory
https://security.gallagher.com/Security-Advisories/CVE-2021-23155Vendor Advisory

Timeline

Published: Nov 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23155?

How severe is CVE-2021-23155?

CVE-2021-23155 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23155?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23155?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST