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CVE-2021-23155

22
FAUCET Score

CVE-2021-23155 describes an improper validation of cloud certificate chains in the Gallagher Command Centre Mobile Client for Android, affecting versions 8.60 prior to 8.60.065, and all versions 8.50 and earlier. This flaw enables a man-in-the-middle (MITM) attack, allowing an attacker to impersonate the legitimate Command Centre Server. With a CVSS score of 6.8 (Medium), this vulnerability has a network attack vector and high impact on confidentiality, but requires high attack complexity and no user interaction. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.50CPE matchmatch criteria
cpe:2.3:a:gallagher:command_centre_mobile_client:*:*:*:*:*:android:*:*
>= 8.60, < 8.60.065CPE matchmatch criteria
cpe:2.3:a:gallagher:command_centre_mobile_client:*:*:*:*:*:android:*:*

CVSS Data

CVSS version used by this source: 3.1

9.0CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
37.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 5th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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