{
    "id": "CVE-2018-6789",
    "published": "2018-02-08 23:29:01",
    "last_modified": "2026-06-17 02:02:17",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-120",
    "description": "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.",
    "epss_score": "0.82137",
    "epss_percentile": "0.99646",
    "kev": 1,
    "kev_due": "2022-05-03",
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:22:24",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2022-05-03."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "exim",
            "product": "exim"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2018-6789",
        "date_added": "2021-11-03",
        "due_date": "2022-05-03",
        "vendor": "Exim",
        "product": "Exim",
        "name": "Exim Buffer Overflow Vulnerability",
        "ransomware": 1
    },
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "45671",
            "title": "exim 4.90 - Remote Code Execution",
            "date": "2018-10-24",
            "url": "https://www.exploit-db.com/exploits/45671"
        },
        {
            "source": "exploit-db",
            "ref_id": "44571",
            "title": "Exim < 4.90.1 - 'base64d' Remote Code Execution",
            "date": "2018-05-02",
            "url": "https://www.exploit-db.com/exploits/44571"
        }
    ],
    "refs_list": [
        "http://openwall.com/lists/oss-security/2018/02/10/2",
        "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html",
        "http://www.openwall.com/lists/oss-security/2018/02/07/2",
        "http://www.securityfocus.com/bid/103049",
        "http://www.securitytracker.com/id/1040461",
        "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
        "https://exim.org/static/doc/security/CVE-2018-6789.txt",
        "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1",
        "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html",
        "https://usn.ubuntu.com/3565-1/",
        "https://www.debian.org/security/2018/dsa-4110",
        "https://www.exploit-db.com/exploits/44571/",
        "https://www.exploit-db.com/exploits/45671/",
        "http://openwall.com/lists/oss-security/2018/02/10/2",
        "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html",
        "http://www.openwall.com/lists/oss-security/2018/02/07/2",
        "http://www.securityfocus.com/bid/103049",
        "http://www.securitytracker.com/id/1040461",
        "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
        "https://exim.org/static/doc/security/CVE-2018-6789.txt",
        "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1",
        "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html",
        "https://usn.ubuntu.com/3565-1/",
        "https://www.debian.org/security/2018/dsa-4110",
        "https://www.exploit-db.com/exploits/44571/"
    ]
}