CVE-2021-23162Network attack vector

Server impersonation via improper certificate-chain validation

Published Nov 18, 2021 · Updated Sep 16, 2024

Improper certificate validation in Gallagher Mobile Connect for Android before 15.04.040 allows attackers to impersonate the Command Centre Server. Gallagher identifies the cloud certificate-chain validation path as the locus but has not published the specific validation step that fails. The attacker must obtain a man-in-the-middle position between the app and its server, after which the fraudulent endpoint can handle the app's server traffic.

CVSS severity7.7
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper certificate validation in Gallagher Mobile Connect for Android before 15.04.040 allows attackers to impersonate the Command Centre Server. Gallagher identifies the cloud certificate-chain validation path as the locus but has not published the specific validation step that fails. The attacker must obtain a man-in-the-middle position between the app and its server, after which the fraudulent endpoint can handle the app's server traffic.

The record

CVE
CVE-2021-23162
Published
Nov 18, 2021
Updated
Sep 16, 2024
Vendor
Gallagher Security
Product
Gallagher Mobile Connect
Classifications
CWE-296, CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15 <15.04.040
  2. Affected versionversion=unspecified <=14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gallagher Security · Gallagher Mobile Connectversion=15 <15.04.040; version=unspecified <=14

Published CVSS scores

7.7Gallagher Group Ltd.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-296Improper Following of a Certificate's Chain of Trust
CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo