CVE-2025-40896 PUBLISHED

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

Assigner: Nozomi
Reserved: 16.04.2025 Published: 04.03.2026 Updated: 04.03.2026

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.

CVSS 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
CVSS Score: 6.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Nozomi Networks
Product	Arc
Versions	Default: unaffected affected from 0 to 2.2.0 (excl.)

Solutions

Upgrade Arc to v2.2.0 or later.

Credits

This issue was found by Felix Eberstaller of Limes Security during a VAPT testing session commissioned by one of our customers. finder

References

https://security.nozominetworks.com/NN-2025:18-01

Problem Types

CWE-295 Improper Certificate Validation CWE

Impacts

CAPEC-475 Signature Spoofing by Improper Validation