Vulnerability-Lookup

FKIE_CVE-2025-42611

Vulnerability from fkie_nvd - Published: 2026-05-05 11:16 - Updated: 2026-05-05 11:16

Severity ?

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

RouterOS provides various services that rely on correct verification of client and server certificates to secure confidentiality and integrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X), among others. The vulnerability lies in shared certificate validation logic which uses the system certificate store that is shared and equally trusted by all system services. This causes confusion of scope, allowing any certificate authority present in the system-wide trust store to be trusted in any context (with some exceptions), allowing partial or full authentication bypass in CAPsMAN, OpenVPN, Dot1X and potentially others.

References

	URL	Tags
	a6d3dc9e-0591-4a13-bce7-0f5b31ff6158	https://www.cert.si/en/cve-2025-42611/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "RouterOS provides various services that rely on correct\nverification of client and server certificates to secure confidentiality and\nintegrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X),\namong others.\n\n\n\nThe vulnerability lies in shared certificate validation\nlogic which uses the system certificate store that is shared and equally\ntrusted by all system services. This causes confusion of scope, allowing any\ncertificate authority present in the system-wide trust store to be trusted in\nany context (with some exceptions), allowing partial or full authentication\nbypass in CAPsMAN, OpenVPN, Dot1X and potentially others."
    }
  ],
  "id": "CVE-2025-42611",
  "lastModified": "2026-05-05T11:16:31.827",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
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        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-05T11:16:31.827",
  "references": [
    {
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "url": "https://www.cert.si/en/cve-2025-42611/"
    }
  ],
  "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
      "type": "Secondary"
    }
  ]
}

CVE-2025-42611 (GCVE-0-2025-42611)

Vulnerability from cvelistv5 – Published: 2026-05-05 10:58 – Updated: 2026-05-05 12:49

Title

Improper certificate validation in multiple RouterOS services

Summary

Severity ?

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

ENISA

References

URL

Tags

https://www.cert.si/en/cve-2025-42611/

third-party-advisorygovernment-resource

Impacted products

	Vendor	Product	Version
	Mikrotik	RouterOS	Affected: 0 , ≤ 7.20.x (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-42611",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-05T12:38:09.152163Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-05T12:49:47.495Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "RouterOS",
          "vendor": "Mikrotik",
          "versions": [
            {
              "lessThanOrEqual": "7.20.x",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eRouterOS provides various services that rely on correct\nverification of client and server certificates to secure confidentiality and\nintegrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X),\namong others.\u003c/p\u003e\u003cp\u003eThe vulnerability lies in shared certificate validation\nlogic which uses the system certificate store that is shared and equally\ntrusted by all system services. This causes confusion of scope, allowing any\ncertificate authority present in the system-wide trust store to be trusted in\nany context (with some exceptions), allowing partial or full authentication\nbypass in CAPsMAN, OpenVPN, Dot1X and potentially others. \u003c/p\u003e\n\n\n\n\n\n\u003cbr\u003e"
            }
          ],
          "value": "RouterOS provides various services that rely on correct\nverification of client and server certificates to secure confidentiality and\nintegrity of communications. This includes OpenVPN, CAPsMAN, Dot1x (802.1X),\namong others.\n\n\n\nThe vulnerability lies in shared certificate validation\nlogic which uses the system certificate store that is shared and equally\ntrusted by all system services. This causes confusion of scope, allowing any\ncertificate authority present in the system-wide trust store to be trusted in\nany context (with some exceptions), allowing partial or full authentication\nbypass in CAPsMAN, OpenVPN, Dot1X and potentially others."
        }
      ],
      "impacts": [
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          "capecId": "CAPEC-115",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-115 Authentication Bypass"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
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              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "shortName": "ENISA"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory",
            "government-resource"
          ],
          "url": "https://www.cert.si/en/cve-2025-42611/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Improper certificate validation in multiple RouterOS services",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
    "assignerShortName": "ENISA",
    "cveId": "CVE-2025-42611",
    "datePublished": "2026-05-05T10:58:36.937Z",
    "dateReserved": "2025-04-16T12:34:02.865Z",
    "dateUpdated": "2026-05-05T12:49:47.495Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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

FKIE_CVE-2025-42611

CVE-2025-42611 (GCVE-0-2025-42611)

Tags

Sightings

Nomenclature