Medium severity · published Mar 4, 2026
CVE-2025-40896
Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0
4.8
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AR
Arc · Nozomi Networks
before 2.2.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40896
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-40896
Vendor Advisory
https://security.nozominetworks.com/NN-2025:18-01
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