{
  "document": {
    "aggregate_severity": {
      "text": "Critical"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu18.04els/vex/2023/cve-2023-46853-els_os-ubuntu18_04els.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-06-13T08:37:13Z",
      "generator": {
        "date": "2026-06-13T08:37:13Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2023-46853-ELS_OS-UBUNTU18.04ELS",
      "initial_release_date": "2023-10-27T20:15:00Z",
      "revision_history": [
        {
          "date": "2023-10-27T20:15:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-11-29T14:42:35Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2025-12-23T22:15:38Z",
          "number": "3",
          "summary": "Update document"
        },
        {
          "date": "2026-06-13T08:37:13Z",
          "number": "4",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "4"
    },
    "title": "Security update on CVE-2023-46853"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 18.04",
                "product": {
                  "name": "Ubuntu 18.04",
                  "product_id": "Ubuntu-18",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
        ],
        "category": "vendor",
        "name": "Canonical Ltd."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64",
                "product": {
                  "name": "memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64",
                  "product_id": "memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/memcached@1.5.6-0ubuntu1.2%2Btuxcare.els1?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "CloudLinux"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64 as a component of Ubuntu 18.04",
          "product_id": "Ubuntu-18:memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64"
        },
        "product_reference": "memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-18"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-46853",
      "cwe": {
        "id": "CWE-193",
        "name": "Off-by-one Error"
      },
      "notes": [
        {
          "category": "description",
          "text": "In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \\n is used instead of \\r\\n.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
      ],
      "product_status": {
        "known_not_affected": [
          "Ubuntu-18:memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2023-46853"
        },
        {
          "category": "external",
          "summary": "https://github.com/memcached/memcached/commit/6987918e9a3094ec4fc8976f01f769f624d790fa",
          "url": "https://github.com/memcached/memcached/commit/6987918e9a3094ec4fc8976f01f769f624d790fa"
        },
        {
          "category": "external",
          "summary": "https://github.com/memcached/memcached/compare/1.6.21...1.6.22",
          "url": "https://github.com/memcached/memcached/compare/1.6.21...1.6.22"
        }
      ],
      "release_date": "2023-10-27T20:15:00Z",
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Ubuntu-18:memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        },
        {
          "category": "impact",
          "date": "2026-06-12T12:58:18.976822Z",
          "details": "CVE-2023-46853 is an off-by-one flaw in Memcached’s built-in proxy request parser that is only reachable when the daemon is built and running in proxy mode. Memcached 1.5.6 predates the 1.6.x proxy subsystem entirely, so the vulnerable proxy code path does not exist in this version and it is not affected.",
          "product_ids": [
            "Ubuntu-18:memcached-0:1.5.6-0ubuntu1.2+tuxcare.els1.amd64"
          ]
        }
      ]
    }
  ]
}