cve-2018-6789

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Critical"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright © Red Hat, Inc. All rights reserved.",
      "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 Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-6789.json"
      }
    ],
    "title": "exim: buffer overflow in b64decode() function, possibly leading to remote code execution",
    "tracking": {
      "current_release_date": "2026-01-09T09:05:19+00:00",
      "generator": {
        "date": "2026-01-09T09:05:19+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "4.6.14"
        }
      },
      "id": "CVE-2018-6789",
      "initial_release_date": "2018-02-07T00:00:00+00:00",
      "revision_history": [
        {
          "date": "2018-02-07T00:00:00+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-01-27T18:30:06+00:00",
          "number": "2",
          "summary": "Current version"
        },
        {
          "date": "2026-01-09T09:05:19+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Enterprise Linux 5",
                "product": {
                  "name": "Red Hat Enterprise Linux 5",
                  "product_id": "red_hat_enterprise_linux_5",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:enterprise_linux:5"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Enterprise Linux 5"
          },
          {
            "category": "product_version",
            "name": "exim",
            "product": {
              "name": "exim",
              "product_id": "exim",
              "product_identification_helper": {
                "purl": "pkg:rpm/redhat/exim?arch=src"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "exim as a component of Red Hat Enterprise Linux 5",
          "product_id": "red_hat_enterprise_linux_5:exim"
        },
        "product_reference": "exim",
        "relates_to_product_reference": "red_hat_enterprise_linux_5"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2018-6789",
      "discovery_date": "2018-02-08T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1543268"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "exim: buffer overflow in b64decode() function, possibly leading to remote code execution",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects the versions of Exim as shipped in Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is already in the Extended Life Phase of its life cycle and Exim is not on the list of components supported via Red Hat Enterprise Linux 5 Extended Life-cycle Support (ELS) add-on, therefore there's currently no plan to address this issue in Red Hat Enterprise Linux 5. For more information about Red Hat Enterprise Linux 5 life cycle and ELS add-on scope of support, see:\n\nhttps://access.redhat.com/support/policy/updates/errata/#Extended_Life_Cycle_Phase\nhttps://access.redhat.com/articles/2901071\n\nThe Exim mail server is not shipped in Red Hat Enterprise Linux 6 and 7.",
          "title": "Statement"
        },
        {
          "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"
        }
      ],
      "product_status": {
        "known_affected": [
          "red_hat_enterprise_linux_5:exim"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-6789"
        },
        {
          "category": "external",
          "summary": "RHBZ#1543268",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1543268"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-6789",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-6789"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-6789",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-6789"
        },
        {
          "category": "external",
          "summary": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
          "url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
        },
        {
          "category": "external",
          "summary": "https://exim.org/static/doc/security/CVE-2018-6789.txt",
          "url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
        },
        {
          "category": "external",
          "summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
          "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        }
      ],
      "release_date": "2018-02-07T00:00:00+00:00",
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "Will not fix",
          "product_ids": [
            "red_hat_enterprise_linux_5:exim"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "red_hat_enterprise_linux_5:exim"
          ]
        }
      ],
      "threats": [
        {
          "category": "exploit_status",
          "date": "2021-11-03T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Critical",
          "product_ids": [
            "red_hat_enterprise_linux_5:exim"
          ]
        }
      ],
      "title": "exim: buffer overflow in b64decode() function, possibly leading to remote code execution"
    }
  ]
}