FKIE_CVE-2019-18676

Vulnerability from fkie_nvd - Published: 2019-11-26 17:15 - Updated: 2026-06-17 02:25
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
References
cve@mitre.orghttp://www.squid-cache.org/Advisories/SQUID-2019_8.txtThird Party Advisory
cve@mitre.orghttp://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patchPatch
cve@mitre.orghttps://bugzilla.suse.com/show_bug.cgi?id=1156329Issue Tracking, Third Party Advisory
cve@mitre.orghttps://github.com/squid-cache/squid/pull/275Patch, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
cve@mitre.orghttps://usn.ubuntu.com/4213-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/4446-1/Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2020/dsa-4682Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.squid-cache.org/Advisories/SQUID-2019_8.txtThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patchPatch
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1156329Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/squid-cache/squid/pull/275Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4213-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4446-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4682Third Party Advisory
Impacted products
Vendor Product Version
squid-cache squid *
squid-cache squid *
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
canonical ubuntu_linux 19.04
canonical ubuntu_linux 19.10
fedoraproject fedora 30
fedoraproject fedora 31
debian debian_linux 9.0
debian debian_linux 10.0
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
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              "matchCriteriaId": "FC9F2659-B37B-4E7B-AE40-B91BF3CE4E88",
              "versionEndIncluding": "3.5.28",
              "versionStartIncluding": "3.0",
              "vulnerable": true
            },
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              "matchCriteriaId": "A278895E-7005-4F4B-8649-A013F60E33D4",
              "versionEndIncluding": "4.8",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme."
    },
    {
      "lang": "es",
      "value": "Se descubri\u00f3 un problema en Squid versiones 2.x, 3.x y versiones 4.x hasta 4.8. Debido a una comprobaci\u00f3n de entrada incorrecta, hay  un desbordamiento del b\u00fafer en la regi\u00f3n heap de la memoria que puede resultar en una Denegaci\u00f3n de Servicio a todos los clientes que usan el proxy. La gravedad es alta debido a que esta vulnerabilidad ocurre antes de las comprobaciones de seguridad normales; cualquier cliente remoto que pueda alcanzar el puerto proxy puede realizar trivialmente el ataque por medio de un esquema de URI especialmente dise\u00f1ado."
    }
  ],
  "id": "CVE-2019-18676",
  "lastModified": "2026-06-17T02:25:16.773",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "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"
      }
    ]
  },
  "published": "2019-11-26T17:15:12.843",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "http://www.squid-cache.org/Advisories/SQUID-2019_8.txt"
    },
    {
      "source": "cve@mitre.org",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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