What’s Vulnerable › Vulnerabilities
CVE-2025-40896: Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0
- Severity: medium (CVSS 4.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-06-17
- Weakness: CWE-295
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.
Affected products
- Nozomi Networks Arc: before 2.2.0 — fixed in 2.2.0
How to fix
Upgrade to a fixed version: Nozomi Networks Arc 2.2.0. Check the vendor advisory for mitigations.
References
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