FKIE_CVE-2020-7462

Vulnerability from fkie_nvd - Published: 2021-03-26 21:15 - Updated: 2026-06-17 03:24
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In 11.4-PRERELEASE before r360733 and 11.3-RELEASE before p13, improper mbuf handling in the kernel causes a use-after-free bug by sending IPv6 Hop-by-Hop options over the loopback interface. The use-after-free situation may result in unintended kernel behaviour including a kernel panic.
References
secteam@freebsd.orghttps://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.ascVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.ascVendor Advisory
Impacted products
Vendor Product Version
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.3
freebsd freebsd 11.4
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "FreeBSD",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "FreeBSD 11.3-RELEASE before p13"
            }
          ]
        }
      ],
      "source": "secteam@freebsd.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:-:*:*:*:*:*:*",
              "matchCriteriaId": "F35957CE-AF9F-40CA-BDD1-FA6A0E73783F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p1:*:*:*:*:*:*",
              "matchCriteriaId": "EA929713-B797-494A-853D-C121D9D69519",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p10:*:*:*:*:*:*",
              "matchCriteriaId": "B87AF171-95AC-4DDA-8D94-694F85638B46",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p11:*:*:*:*:*:*",
              "matchCriteriaId": "1CC8B031-41BB-4846-B092-7E4BC6F35D6B",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p12:*:*:*:*:*:*",
              "matchCriteriaId": "83E34012-BC9D-4F0C-AAE1-FE5767B4EED6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p2:*:*:*:*:*:*",
              "matchCriteriaId": "3C3D8EDC-91D3-45B2-AC1D-EF4346D4A714",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p3:*:*:*:*:*:*",
              "matchCriteriaId": "EA5006FF-06A5-4D95-BF5B-29F26248D11F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p4:*:*:*:*:*:*",
              "matchCriteriaId": "A705031B-FD63-4076-B92E-E826E11D7111",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p5:*:*:*:*:*:*",
              "matchCriteriaId": "11C1EFB1-68E5-45F4-A7E1-744574F290D1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p6:*:*:*:*:*:*",
              "matchCriteriaId": "25F649A7-9265-4552-8934-BCE083363982",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p7:*:*:*:*:*:*",
              "matchCriteriaId": "F202C856-5B95-4796-AC4A-1F210E7BAB8F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p8:*:*:*:*:*:*",
              "matchCriteriaId": "9419C866-C478-4CDE-A9A1-E592D8FF0933",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.3:p9:*:*:*:*:*:*",
              "matchCriteriaId": "2B6DFC23-A7A1-431A-9AD9-A820579F95F0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:11.4:-:*:*:*:*:*:*",
              "matchCriteriaId": "4A865EA1-01D7-4E5A-9D13-80780F8A9D7A",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In 11.4-PRERELEASE before r360733 and 11.3-RELEASE before p13, improper mbuf handling in the kernel causes a use-after-free bug by sending IPv6 Hop-by-Hop options over the loopback interface. The use-after-free situation may result in unintended kernel behaviour including a kernel panic."
    },
    {
      "lang": "es",
      "value": "En versiones 11.4-PRERELEASE anteriores a r360733 y 11.3-RELEASE anteriores a p13, el manejo inapropiado de mbuf en el kernel causa un error de uso de la memoria previamente liberada mediante el env\u00edo opciones IPv6 Hop-by-Hop por medio de la interfaz de loopback.\u0026#xa0;La situaci\u00f3n de uso de la memoria previamente liberada puede resultar en un comportamiento del kernel no deseado, incluyendo un p\u00e1nico del kernel."
    }
  ],
  "id": "CVE-2020-7462",
  "lastModified": "2026-06-17T03:24:49.650",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 4.9,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-26T21:15:13.117",
  "references": [
    {
      "source": "secteam@freebsd.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.asc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-20:24.ipv6.asc"
    }
  ],
  "sourceIdentifier": "secteam@freebsd.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "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

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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