NN-2025:18-01

Vulnerability from csaf_nozominetworks - Published: 2026-03-04 11:00 - Updated: 2026-03-04 11:00
Summary
Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0

Notes

Risk Level for Nozomi customers
Medium
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "text": "MEDIUM"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "other",
        "text": "Medium",
        "title": "Risk Level for Nozomi customers"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "Nozomi Networks Product Security team can be reached at prodsec@nozominetworks.com",
      "name": "Nozomi Networks Product Security",
      "namespace": "https://security.nozominetworks.com/psirt"
    },
    "title": "Lack of TLS certificate validation when connecting Arc to a Guardian or CMC, in Arc before v2.2.0",
    "tracking": {
      "aliases": [
        "CVE-2025-40896"
      ],
      "current_release_date": "2026-03-04T11:00:00.000Z",
      "id": "NN-2025:18-01",
      "initial_release_date": "2026-03-04T11:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-03-04T11:00:00.000Z",
          "number": "1",
          "summary": "Initial revision"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:gem/\u003c2.2.0",
                "product": {
                  "name": "Nozomi Networks Arc \u003c2.2.0",
                  "product_id": "CSAFPID-0001"
                }
              },
              {
                "category": "product_version",
                "name": "2.2.0",
                "product": {
                  "name": "Nozomi Networks Arc 2.2.0",
                  "product_id": "CSAFPID-0002"
                }
              }
            ],
            "category": "product_name",
            "name": "Arc"
          }
        ],
        "category": "vendor",
        "name": "Nozomi Networks"
      }
    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Felix Eberstaller"
          ],
          "organization": "Limes Security",
          "summary": "finding this issue during a VAPT testing session commissioned by one of our customers"
        }
      ],
      "cve": "CVE-2025-40896",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
      },
      "discovery_date": "2026-03-04T11:00:00.000Z",
      "ids": [
        {
          "system_name": "Nozomi Networks Security Advisory ID",
          "text": "NN-2025:18-01"
        }
      ],
      "notes": [
        {
          "category": "summary",
          "text": "The server certificate was not verified when an Arc agent connected to a Guardian or CMC.",
          "title": "Vulnerability summary"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-0002"
        ],
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "Mitre CVE entry",
          "url": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-40896"
        },
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://security.nozominetworks.com/csaf/2026/nn-2025_18-01.json"
        },
        {
          "category": "self",
          "summary": "Human-readable advisory.",
          "url": "https://security.nozominetworks.com/NN-2025:18-01"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "N/A",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Upgrade Arc to v2.2.0 or later.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "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"
    }
  ]
}


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