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FKIE_CVE-2023-20027

Vulnerability from fkie_nvd - Published: 2023-03-23 17:15 - Updated: 2026-06-17 05:29
Summary
A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Impacted products
Vendor Product Version
cisco ios_xe 3.9.0as
cisco ios_xe 3.9.1s
cisco ios_xe 3.9.2s
cisco ios_xe 3.10.0s
cisco ios_xe 3.10.1s
cisco ios_xe 3.10.2as
cisco ios_xe 3.10.2s
cisco ios_xe 3.10.2ts
cisco ios_xe 3.10.3s
cisco ios_xe 3.10.4s
cisco ios_xe 3.10.5s
cisco ios_xe 3.10.6s
cisco ios_xe 3.10.7s
cisco ios_xe 3.10.8as
cisco ios_xe 3.10.8s
cisco ios_xe 3.10.9s
cisco ios_xe 3.10.10s
cisco ios_xe 3.11.0s
cisco ios_xe 3.11.1s
cisco ios_xe 3.11.2s
cisco ios_xe 3.11.3s
cisco ios_xe 3.11.4s
cisco ios_xe 3.12.0s
cisco ios_xe 3.12.1s
cisco ios_xe 3.12.2s
cisco ios_xe 3.12.3s
cisco ios_xe 3.12.4s
cisco ios_xe 3.13.0s
cisco ios_xe 3.13.1s
cisco ios_xe 3.13.2s
cisco ios_xe 3.13.3s
cisco ios_xe 3.13.4s
cisco ios_xe 3.13.5s
cisco ios_xe 3.13.6as
cisco ios_xe 3.13.6s
cisco ios_xe 3.13.7s
cisco ios_xe 3.13.8s
cisco ios_xe 3.13.9s
cisco ios_xe 3.13.10s
cisco ios_xe 3.14.0s
cisco ios_xe 3.14.1s
cisco ios_xe 3.14.2s
cisco ios_xe 3.14.3s
cisco ios_xe 3.14.4s
cisco ios_xe 3.15.0s
cisco ios_xe 3.15.1cs
cisco ios_xe 3.15.1s
cisco ios_xe 3.15.2s
cisco ios_xe 3.15.3s
cisco ios_xe 3.15.4s
cisco ios_xe 3.16.0cs
cisco ios_xe 3.16.0s
cisco ios_xe 3.16.1as
cisco ios_xe 3.16.2s
cisco ios_xe 3.16.3s
cisco ios_xe 3.16.4as
cisco ios_xe 3.16.4bs
cisco ios_xe 3.16.4cs
cisco ios_xe 3.16.4ds
cisco ios_xe 3.16.4es
cisco ios_xe 3.16.4gs
cisco ios_xe 3.16.5as
cisco ios_xe 3.16.5bs
cisco ios_xe 3.16.5s
cisco ios_xe 3.16.6bs
cisco ios_xe 3.16.6s
cisco ios_xe 3.16.7as
cisco ios_xe 3.16.7bs
cisco ios_xe 3.16.7s
cisco ios_xe 3.16.8s
cisco ios_xe 3.16.9s
cisco ios_xe 3.16.10s
cisco ios_xe 3.17.0s
cisco ios_xe 3.17.1s
cisco ios_xe 3.17.2s
cisco ios_xe 3.17.3s
cisco ios_xe 3.17.4s
cisco ios_xe 3.18.0as
cisco ios_xe 3.18.2asp
cisco ios_xe 16.2.1
cisco ios_xe 16.2.2
cisco ios_xe 16.3.1
cisco ios_xe 16.3.1a
cisco ios_xe 16.3.2
cisco ios_xe 16.3.3
cisco ios_xe 16.3.4
cisco ios_xe 16.3.5
cisco ios_xe 16.3.6
cisco ios_xe 16.3.7
cisco ios_xe 16.3.8
cisco ios_xe 16.3.9
cisco ios_xe 16.3.10
cisco ios_xe 16.3.11
cisco ios_xe 16.4.1
cisco ios_xe 16.4.2
cisco ios_xe 16.4.3
cisco ios_xe 16.5.1
cisco ios_xe 16.5.1b
cisco ios_xe 16.5.2
cisco ios_xe 16.5.3
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 16.6.4s
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 16.7.2
cisco ios_xe 16.7.3
cisco ios_xe 16.8.1
cisco ios_xe 16.8.1s
cisco ios_xe 16.8.2
cisco ios_xe 16.8.3
cisco ios_xe 16.9.1
cisco ios_xe 16.9.1s
cisco ios_xe 16.9.2
cisco ios_xe 16.9.2s
cisco ios_xe 16.9.3
cisco ios_xe 16.9.3s
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 16.9.8a
cisco ios_xe 16.9.8c
cisco ios_xe 16.10.1
cisco ios_xe 16.10.1a
cisco ios_xe 16.10.1b
cisco ios_xe 16.10.1e
cisco ios_xe 16.10.1s
cisco ios_xe 16.10.2
cisco ios_xe 16.10.3
cisco ios_xe 16.11.1
cisco ios_xe 16.11.1a
cisco ios_xe 16.11.1c
cisco ios_xe 16.11.1s
cisco ios_xe 16.11.2
cisco ios_xe 16.12.1
cisco ios_xe 16.12.1a
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 16.12.2t
cisco ios_xe 16.12.3
cisco ios_xe 16.12.3s
cisco ios_xe 16.12.4
cisco ios_xe 16.12.5
cisco ios_xe 16.12.6
cisco ios_xe 16.12.7
cisco ios_xe 16.12.8
cisco ios_xe 17.1.1
cisco ios_xe 17.1.1s
cisco ios_xe 17.1.1t
cisco ios_xe 17.1.2
cisco ios_xe 17.1.3
cisco ios_xe 17.2.1
cisco ios_xe 17.2.1r
cisco ios_xe 17.2.1v
cisco ios_xe 17.2.2
cisco ios_xe 17.2.3
cisco ios_xe 17.3.1
cisco ios_xe 17.3.1a
cisco ios_xe 17.3.2
cisco ios_xe 17.3.3
cisco ios_xe 17.3.4
cisco ios_xe 17.3.4a
cisco ios_xe 17.3.5
cisco ios_xe 17.4.1
cisco ios_xe 17.4.1a
cisco ios_xe 17.4.1b
cisco ios_xe 17.4.2
cisco ios_xe 17.5.1
cisco ios_xe 17.5.1a
cisco ios_xe 17.6.1
cisco ios_xe 17.6.1a
cisco ios_xe 17.6.2
cisco ios_xe 17.6.3
cisco ios_xe 17.6.3a
cisco ios_xe 17.7.1
cisco ios_xe 17.7.1a
cisco ios_xe 17.7.2
cisco ios_xe 17.8.1
cisco ios_xe 17.8.1a
cisco catalyst_8000v_edge -
cisco cloud_services_router_1000v -
cisco 1000_integrated_services_router -
cisco 1100-4g\/6g_integrated_services_router -
cisco 1100-4g_integrated_services_router -
cisco 1100-4p_integrated_services_router -
cisco 1100-6g_integrated_services_router -
cisco 1100-8p_integrated_services_router -
cisco 1100_integrated_services_router -
cisco 1101-4p_integrated_services_router -
cisco 1101_integrated_services_router -
cisco 1109-2p_integrated_services_router -
cisco 1109-4p_integrated_services_router -
cisco 1109_integrated_services_router -
cisco 1111x-8p_integrated_services_router -
cisco 1111x_integrated_services_router -
cisco 111x_integrated_services_router -
cisco 1120_integrated_services_router -
cisco 1131_integrated_services_router -
cisco 1160_integrated_services_router -
cisco 4221_integrated_services_router -
cisco 4321_integrated_services_router -
cisco 4331_integrated_services_router -
cisco 4351_integrated_services_router -
cisco 4431_integrated_services_router -
cisco 4451-x_integrated_services_router -
cisco 4461_integrated_services_router -
cisco c8200-1n-4t -
cisco c8200l-1n-4t -
cisco c8500l-8s4x -
cisco catalyst_8300-1n1s-4t2x -
cisco catalyst_8300-1n1s-6t -
cisco catalyst_8300-2n2s-4t2x -
cisco catalyst_8300-2n2s-6t -

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco IOS XE Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
    {
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              "matchCriteriaId": "D0EC9A19-26E6-4E69-B4E7-852CB6327EAD",
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            },
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              "matchCriteriaId": "5C5484A4-D116-4B79-8369-47979E20AACA",
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            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xe:3.16.0cs:*:*:*:*:*:*:*",
              "matchCriteriaId": "5568EABF-8F43-4A87-8DE4-A03E9065BE53",
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            },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."
    }
  ],
  "id": "CVE-2023-20027",
  "lastModified": "2026-06-17T05:29:18.753",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-20027",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-10-28T16:24:39.825186Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-03-23T17:15:13.857",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv4-vfr-dos-CXxtFacb"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv4-vfr-dos-CXxtFacb"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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

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.

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Detection rules are retrieved from Rulezet.

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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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