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FKIE_CVE-2020-35498

Vulnerability from fkie_nvd - Published: 2021-02-11 18:15 - Updated: 2026-06-17 03:13
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
References
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
secalert@redhat.comhttps://security.gentoo.org/glsa/202311-16
secalert@redhat.comhttps://www.debian.org/security/2021/dsa-4852Third Party Advisory
secalert@redhat.comhttps://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202311-16
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4852Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List, Patch, Third Party Advisory
Impacted products
Vendor Product Version
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
openvswitch openvswitch *
debian debian_linux 9.0
debian debian_linux 10.0
fedoraproject fedora 33
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "openvswitch",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "openvswitch 2.5.12, openvswitch 2.6.10, openvswitch 2.7.13, openvswitch 2.8.11, openvswitch 2.9.9, openvswitch 2.10.7, openvswitch 2.11.6, openvswitch 2.12.3, openvswitch 2.13.3, openvswitch 2.14.2"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "2.5.12",
              "versionStartIncluding": "2.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E78C71DF-5303-4887-A958-AA8974559F4B",
              "versionEndExcluding": "2.6.10",
              "versionStartIncluding": "2.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F43F9591-492D-42E1-B241-86A19538348C",
              "versionEndExcluding": "2.7.13",
              "versionStartIncluding": "2.7.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7D17633D-6F1B-4482-98D0-F4D87F7E79F1",
              "versionEndExcluding": "2.8.11",
              "versionStartIncluding": "2.8.0",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "4F9E06B0-A849-40E0-BA5E-4B94D51E34AC",
              "versionEndExcluding": "2.9.9",
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              "vulnerable": true
            },
            {
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              "versionEndExcluding": "2.10.7",
              "versionStartIncluding": "2.10.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1B7DFA70-32AD-4739-9020-C32C22A2677E",
              "versionEndExcluding": "2.11.6",
              "versionStartIncluding": "2.11.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B6189A6A-85C4-469E-A1CA-8506ADD26CF6",
              "versionEndExcluding": "2.12.3",
              "versionStartIncluding": "2.12.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "62204DE2-CD28-46B5-AE9A-42F2ADB9CC65",
              "versionEndExcluding": "2.13.3",
              "versionStartIncluding": "2.13.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "170C778E-64B7-484A-9497-9BF6C137B364",
              "versionEndExcluding": "2.14.2",
              "versionStartIncluding": "2.14.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
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              "vulnerable": true
            },
            {
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      ]
    },
    {
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 una vulnerabilidad en openvswitch.\u0026#xa0;Una limitaci\u00f3n en la implementaci\u00f3n del an\u00e1lisis de paquetes del espacio de usuario puede permitir a un usuario malicioso env\u00ede un paquete especialmente dise\u00f1ado, lo que hace que el megaflujo resultante en el kernel sea demasiado amplio, causando potencialmente una denegaci\u00f3n de servicio.\u0026#xa0;La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema"
    }
  ],
  "id": "CVE-2020-35498",
  "lastModified": "2026-06-17T03:13:48.957",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.8,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-35498",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-04-23T13:27:22.375206Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-02-11T18:15:15.677",
  "references": [
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      "tags": [
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  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "secalert@redhat.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

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.


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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.