CVE-2025-40896

Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0

Published Mar 4, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
The server certificate was not verified when an Arc agent connected to a Guardian or CMC.



A malicious actor could perform a man-in-the-middle attack and intercept the communication between the Arc agent and the Guardian or CMC. This could result in theft of the client token and sensitive information (such as assets and alerts), impersonation of the server, or injection of spoofed data (such as false asset information or vulnerabilities) into the Guardian or CMC.

Remediation

Vendor Solution

Upgrade Arc to v2.2.0 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Nozominetworks
Nozominetworks arc
CPEs cpe:2.3:a:nozominetworks:arc:*:*:*:*:*:*:*:*
Vendors & Products Nozominetworks
Nozominetworks arc
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The server certificate was not verified when an Arc agent connected to a Guardian or CMC. A malicious actor could perform a man-in-the-middle attack and intercept the communication between the Arc agent and the Guardian or CMC. This could result in theft of the client token and sensitive information (such as assets and alerts), impersonation of the server, or injection of spoofed data (such as false asset information or vulnerabilities) into the Guardian or CMC.
Title Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0
First Time appeared Nozomi Networks
Nozomi Networks arc
Weaknesses CWE-295
CPEs cpe:2.3:a:nozomi_networks:arc:*:*:*:*:*:*:*:*
Vendors & Products Nozomi Networks
Nozomi Networks arc
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Nozomi
Published
Updated
Mar 4, 2026, 2:11 PM
Reserved
Apr 16, 2025, 9:04 AM
Status
Analyzed
Published
Mar 4, 2026, 2:16 PM
Modified
Jun 17, 2026, 9:22 AM