FKIE_CVE-2025-20311

Vulnerability from fkie_nvd - Published: 2025-09-24 18:15 - Updated: 2026-09-26 00:10
Summary
A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic. This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition.
Impacted products
Vendor Product Version
cisco ios_xe 16.6.1
cisco ios_xe 16.6.2
cisco ios_xe 16.6.3
cisco ios_xe 16.6.4
cisco ios_xe 16.6.4a
cisco ios_xe 16.6.5
cisco ios_xe 16.6.6
cisco ios_xe 16.6.7
cisco ios_xe 16.6.8
cisco ios_xe 16.6.9
cisco ios_xe 16.6.10
cisco ios_xe 16.7.1
cisco ios_xe 16.8.1
cisco ios_xe 16.8.1a
cisco ios_xe 16.8.1s
cisco ios_xe 16.9.1
cisco ios_xe 16.9.1s
cisco ios_xe 16.9.2
cisco ios_xe 16.9.3
cisco ios_xe 16.9.4
cisco ios_xe 16.9.5
cisco ios_xe 16.9.6
cisco ios_xe 16.9.7
cisco ios_xe 16.9.8
cisco ios_xe 16.10.1
cisco ios_xe 16.10.1e
cisco ios_xe 16.10.1s
cisco ios_xe 16.11.1
cisco ios_xe 16.11.1b
cisco ios_xe 16.11.1s
cisco ios_xe 16.12.1
cisco ios_xe 16.12.1c
cisco ios_xe 16.12.1s
cisco ios_xe 16.12.2
cisco ios_xe 16.12.2s
cisco ios_xe 16.12.3
cisco ios_xe 16.12.3a
cisco ios_xe 16.12.3s
cisco ios_xe 16.12.4
cisco ios_xe 16.12.4a
cisco ios_xe 16.12.5
cisco ios_xe 16.12.5b
cisco ios_xe 16.12.6
cisco ios_xe 16.12.6a
cisco ios_xe 16.12.7
cisco ios_xe 16.12.8
cisco ios_xe 16.12.14
cisco ios_xe 17.1.1
cisco ios_xe 17.1.1s
cisco ios_xe 17.1.1t
cisco ios_xe 17.1.3
cisco ios_xe 17.2.1
cisco ios_xe 17.2.1a
cisco ios_xe 17.3.1
cisco ios_xe 17.3.2
cisco ios_xe 17.3.2a
cisco ios_xe 17.3.3
cisco ios_xe 17.3.4
cisco ios_xe 17.3.4b
cisco ios_xe 17.3.5
cisco ios_xe 17.3.6
cisco ios_xe 17.3.7
cisco ios_xe 17.3.8
cisco ios_xe 17.3.8a
cisco ios_xe 17.4.1
cisco ios_xe 17.5.1
cisco ios_xe 17.6.1
cisco ios_xe 17.6.1y
cisco ios_xe 17.6.2
cisco ios_xe 17.6.3
cisco ios_xe 17.6.4
cisco ios_xe 17.6.5
cisco ios_xe 17.6.5a
cisco ios_xe 17.6.6
cisco ios_xe 17.6.6a
cisco ios_xe 17.6.7
cisco ios_xe 17.6.8
cisco ios_xe 17.7.1
cisco ios_xe 17.8.1
cisco ios_xe 17.9.1
cisco ios_xe 17.9.2
cisco ios_xe 17.9.3
cisco ios_xe 17.9.4
cisco ios_xe 17.9.4a
cisco ios_xe 17.9.5
cisco ios_xe 17.9.6
cisco ios_xe 17.9.6a
cisco ios_xe 17.10.1
cisco ios_xe 17.10.1b
cisco ios_xe 17.11.1
cisco ios_xe 17.11.99sw
cisco ios_xe 17.12.1
cisco ios_xe 17.12.1z3
cisco ios_xe 17.12.2
cisco ios_xe 17.12.3
cisco ios_xe 17.12.4
cisco ios_xe 17.13.1
cisco ios_xe 17.14.1
cisco ios_xe 17.15.1
cisco ios_xe 17.15.2
cisco ios_xe 17.15.2a
cisco ios_xe 17.15.2b
cisco ios_xe 17.16.1
cisco catalyst_9200 -
cisco catalyst_9200cx -
cisco catalyst_9200l -
cisco catalyst_9300 -
cisco catalyst_9300-24p-a -
cisco catalyst_9300-24p-e -
cisco catalyst_9300-24s-a -
cisco catalyst_9300-24s-e -
cisco catalyst_9300-24t-a -
cisco catalyst_9300-24t-e -
cisco catalyst_9300-24u-a -
cisco catalyst_9300-24u-e -
cisco catalyst_9300-24ux-a -
cisco catalyst_9300-24ux-e -
cisco catalyst_9300-48p-a -
cisco catalyst_9300-48p-e -
cisco catalyst_9300-48s-a -
cisco catalyst_9300-48s-e -
cisco catalyst_9300-48t-a -
cisco catalyst_9300-48t-e -
cisco catalyst_9300-48u-a -
cisco catalyst_9300-48u-e -
cisco catalyst_9300-48un-a -
cisco catalyst_9300-48un-e -
cisco catalyst_9300-48uxm-a -
cisco catalyst_9300-48uxm-e -
cisco catalyst_9300l -
cisco catalyst_9300l-24p-4g-a -
cisco catalyst_9300l-24p-4g-e -
cisco catalyst_9300l-24p-4x-a -
cisco catalyst_9300l-24p-4x-e -
cisco catalyst_9300l-24t-4g-a -
cisco catalyst_9300l-24t-4g-e -
cisco catalyst_9300l-24t-4x-a -
cisco catalyst_9300l-24t-4x-e -
cisco catalyst_9300l-48p-4g-a -
cisco catalyst_9300l-48p-4g-e -
cisco catalyst_9300l-48p-4x-a -
cisco catalyst_9300l-48p-4x-e -
cisco catalyst_9300l-48t-4g-a -
cisco catalyst_9300l-48t-4g-e -
cisco catalyst_9300l-48t-4x-a -
cisco catalyst_9300l-48t-4x-e -
cisco catalyst_9300l_stack -
cisco catalyst_9300lm -
cisco catalyst_9300x -
cisco catalyst_9400 -
cisco catalyst_9400_supervisor_engine-1 -
cisco catalyst_9407r -
cisco catalyst_9410r -
cisco catalyst_9500 -
cisco catalyst_9500h -
cisco catalyst_9600 -
cisco catalyst_9600_supervisor_engine-1 -
cisco catalyst_9600x -

{
  "affected": [
    {
      "affectedData": [
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          "product": "Cisco IOS XE Software",
          "vendor": "Cisco",
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            {
              "status": "affected",
              "version": "16.6.7"
            },
            {
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              "version": "16.6.8"
            },
            {
              "status": "affected",
              "version": "16.6.9"
            },
            {
              "status": "affected",
              "version": "16.6.10"
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            {
              "status": "affected",
              "version": "16.7.1"
            },
            {
              "status": "affected",
              "version": "16.8.1"
            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
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            },
            {
              "status": "affected",
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            },
            {
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            {
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            },
            {
              "status": "affected",
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            {
              "status": "affected",
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            {
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            {
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            },
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            },
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            },
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            },
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            },
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
              "version": "17.3.3"
            },
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              "status": "affected",
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            },
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              "status": "affected",
              "version": "17.3.4"
            },
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              "status": "affected",
              "version": "17.3.5"
            },
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              "status": "affected",
              "version": "17.3.6"
            },
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              "status": "affected",
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              "status": "affected",
              "version": "17.3.7"
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              "status": "affected",
              "version": "17.3.8"
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              "status": "affected",
              "version": "17.3.8a"
            },
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              "status": "affected",
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            },
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              "status": "affected",
              "version": "17.5.1"
            },
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              "status": "affected",
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              "status": "affected",
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            },
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "17.9.3"
            },
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              "status": "affected",
              "version": "17.9.4"
            },
            {
              "status": "affected",
              "version": "17.9.5"
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              "status": "affected",
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            {
              "status": "affected",
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              "status": "affected",
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              "status": "affected",
              "version": "17.11.1"
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            },
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              "status": "affected",
              "version": "17.12.2"
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            {
              "status": "affected",
              "version": "17.12.3"
            },
            {
              "status": "affected",
              "version": "17.12.4"
            },
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              "status": "affected",
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            },
            {
              "status": "affected",
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            },
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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            {
              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
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          "negate": false,
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      "operator": "AND"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic.\r\n\r This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el manejo de ciertos frames Ethernet en el software Cisco IOS XE para switches de la serie Catalyst 9000 podr\u00eda permitir a un atacante adyacente no autenticado causar que un puerto de salida se bloquee y descarte todo el tr\u00e1fico saliente. Esta vulnerabilidad se debe al manejo inadecuado de frames Ethernet manipulados. Un atacante podr\u00eda explotar esta vulnerabilidad enviando frames Ethernet manipulados a trav\u00e9s de un switch afectado. Un exploit exitoso podr\u00eda permitir al atacante causar que el puerto de salida al que se reenv\u00eda el frame manipulado comience a descartar todos los frames, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)."
    }
  ],
  "id": "CVE-2025-20311",
  "lastModified": "2026-09-26T00:10:00.127",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.0,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-20311",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-09-24T18:07:27.423618Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-09-24T18:15:34.757",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat9k-PtmD7bgy"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-19"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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