Vulnerability-Lookup

CVE-2025-40896 (GCVE-0-2025-40896)

Vulnerability from cvelistv5 – Published: 2026-03-04 13:52 – Updated: 2026-03-04 14:11

Title

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

Summary

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.

Severity ?

6.3 (Medium)


                        
                          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

6.5 (Medium)


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

CWE

CWE-295 - Improper Certificate Validation

Assigner

Nozomi

References

URL

Tags

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

Impacted products

	Vendor	Product	Version
	Nozomi Networks	Arc	Affected: 0 , < 2.2.0 (semver)

Credits

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

Show details on NVD website

JSON

To clipboard

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GHSA-32R6-GFFX-PJ25

Vulnerability from github – Published: 2026-03-04 15:30 – Updated: 2026-03-04 15:30

Details

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.

Severity ?

6.5 (Medium)


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

6.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-04T14:16:14Z",
    "severity": "MODERATE"
  },
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  "modified": "2026-03-04T15:30:35Z",
  "published": "2026-03-04T15:30:35Z",
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    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40896"
    },
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}

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

JSON

To clipboard

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      "text": "MEDIUM"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
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        "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",
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      "namespace": "https://security.nozominetworks.com/psirt"
    },
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      "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": {
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            "branches": [
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                "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"
                }
              }
            ],
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        {
          "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"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-40896 (GCVE-0-2025-40896)

GHSA-32R6-GFFX-PJ25

NN-2025:18-01

Tags

Sightings

Nomenclature