csaf_certbund - wid-sec-w-2025-1361

WID-SEC-W-2025-1361

Vulnerability from csaf_certbund - Published: 2025-06-19 22:00 - Updated: 2025-06-19 22:00

Summary

Cisco Meraki MX: Schwachstelle ermöglicht Denial of Service

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

Die Cisco Meraki MX-Serie sind cloudverwaltete Sicherheits- und SD-WAN-Appliances

Angriff

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Meraki MX ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme

- Sonstiges

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Die Cisco Meraki MX-Serie sind cloudverwaltete Sicherheits- und SD-WAN-Appliances",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco Meraki MX ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2025-1361 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-1361.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2025-1361 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-1361"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisory cisco-sa-meraki-mx-vpn-dos-sM5GCfm7 vom 2025-06-19",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-sM5GCfm7"
      }
    ],
    "source_lang": "en-US",
    "title": "Cisco Meraki MX: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2025-06-19T22:00:00.000+00:00",
      "generator": {
        "date": "2025-06-20T10:24:00.329+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.12"
        }
      },
      "id": "WID-SEC-W-2025-1361",
      "initial_release_date": "2025-06-19T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2025-06-19T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c18.107.13",
                "product": {
                  "name": "Cisco Meraki MX \u003c18.107.13",
                  "product_id": "T044743"
                }
              },
              {
                "category": "product_version",
                "name": "18.107.13",
                "product": {
                  "name": "Cisco Meraki MX 18.107.13",
                  "product_id": "T044743-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/h:cisco:meraki_mx:18.107.13"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c18.211.6",
                "product": {
                  "name": "Cisco Meraki MX \u003c18.211.6",
                  "product_id": "T044744"
                }
              },
              {
                "category": "product_version",
                "name": "18.211.6",
                "product": {
                  "name": "Cisco Meraki MX 18.211.6",
                  "product_id": "T044744-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/h:cisco:meraki_mx:18.211.6"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c19.1.8",
                "product": {
                  "name": "Cisco Meraki MX \u003c19.1.8",
                  "product_id": "T044745"
                }
              },
              {
                "category": "product_version",
                "name": "19.1.8",
                "product": {
                  "name": "Cisco Meraki MX 19.1.8",
                  "product_id": "T044745-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/h:cisco:meraki_mx:19.1.8"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003e=16.2",
                "product": {
                  "name": "Cisco Meraki MX \u003e=16.2",
                  "product_id": "T044747"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003e=16.2",
                "product": {
                  "name": "Cisco Meraki MX \u003e=16.2",
                  "product_id": "T044747-fixed"
                }
              }
            ],
            "category": "product_name",
            "name": "Meraki MX"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-20271",
      "product_status": {
        "known_affected": [
          "T044744",
          "T044743",
          "T044745"
        ]
      },
      "release_date": "2025-06-19T22:00:00.000+00:00",
      "title": "CVE-2025-20271"
    }
  ]
}

CVE-2025-20271 (GCVE-0-2025-20271)

Vulnerability from cvelistv5 – Published: 2025-06-18 16:38 – Updated: 2025-06-18 17:58

Summary

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. This vulnerability is due to variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established, effectively making the Cisco AnyConnect VPN service unavailable for all legitimate users.

Severity ?

8.6 (High)


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

CWE

CWE-457 - Use of Uninitialized Variable

Assigner

cisco

References

URL

Tags

https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

	Vendor	Product	Version
	Cisco	Cisco Meraki MX Firmware	Affected: N/A

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-20271",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-18T17:56:26.880823Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-18T17:58:55.159Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Cisco Meraki MX Firmware",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "N/A"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device.\r\n\r\nThis vulnerability is due to\u0026nbsp;variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established, effectively making the Cisco AnyConnect VPN service unavailable for all legitimate users."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-457",
              "description": "Use of Uninitialized Variable",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T16:38:00.686Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-meraki-mx-vpn-dos-sM5GCfm7",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-sM5GCfm7"
        }
      ],
      "source": {
        "advisory": "cisco-sa-meraki-mx-vpn-dos-sM5GCfm7",
        "defects": [
          "CSCwo79255"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Meraki MX and Z Series AnyConnect VPN with Client Certificate Authentication Denial of Service Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2025-20271",
    "datePublished": "2025-06-18T16:38:00.686Z",
    "dateReserved": "2024-10-10T19:15:13.245Z",
    "dateUpdated": "2025-06-18T17:58:55.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

WID-SEC-W-2025-1361

CVE-2025-20271 (GCVE-0-2025-20271)

Tags

Sightings

Nomenclature