CVE-2021-23155

Q: How do I fix CVE-2021-23155?

Upgrade command centre mobile client to 8.60.065 or later.

Q: Is CVE-2021-23155 being actively exploited?

Not that we know of. CVE-2021-23155 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.47% is the estimated probability that it will be exploited in the next 30 days. That is higher than 38% of all scored CVEs.

Q: How severe is CVE-2021-23155?

CVE-2021-23155 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-23155 affect?

Published advisories record a fix for command centre mobile client (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICAL

9.0

CVSS v3

NVD

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.

CWE-296 CWE-295Improper Certificate Validation

How to fix

Remediation Available

command centre mobile clientNVD

Affected:>= 8.60, < 8.60.065Fixed in:8.60.065CVE-2021-23155derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.47%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Vendor Advisory1

security.gallagher.com

Related Vulnerabilities

Other CWE-296 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-44532	Medium	5.3	10%	-	Fix
CVE-2019-3890	High	8.1	1.0%	-	Fix
CVE-2021-1566	High	7.4	0.7%	-	Fix
CVE-2019-3762	High	7.5	0.6%	-	-
CVE-2026-44852	High	7.2	0.4%	-	Fix
CVE-2025-48057	Critical	9.8	0.4%	-	Fix

Common questions

How do I fix CVE-2021-23155?

Upgrade command centre mobile client to 8.60.065 or later.

Is CVE-2021-23155 being actively exploited?

Not that we know of. CVE-2021-23155 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.47% is the estimated probability that it will be exploited in the next 30 days. That is higher than 38% of all scored CVEs.

How severe is CVE-2021-23155?

CVE-2021-23155 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-23155 affect?

Published advisories record a fix for command centre mobile client (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.