CVE-2018-6789

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Source
https://cve.org/CVERecord?id=CVE-2018-6789
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-6789.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-6789
Downstream
Related
Published
2018-02-08T23:29:01Z
Modified
2026-08-18T11:19:18Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

Database specific 
{
    "unresolved_ranges":  [
        {
            "cpes":  [
                "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"
            ],
            "extracted_events":  [
                {
                    "introduced":  "14.04"
                },
                {
                    "last_affected":  "14.04"
                },
                {
                    "introduced":  "16.04"
                },
                {
                    "last_affected":  "16.04"
                },
                {
                    "introduced":  "17.10"
                },
                {
                    "last_affected":  "17.10"
                }
            ],
            "source":  "CPE_STRING",
            "vendor_product":  "canonical:ubuntu_linux"
        },
        {
            "cpes":  [
                "cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "extracted_events":  [
                {
                    "introduced":  "7.0"
                },
                {
                    "last_affected":  "7.0"
                },
                {
                    "introduced":  "8.0"
                },
                {
                    "last_affected":  "8.0"
                },
                {
                    "introduced":  "9.0"
                },
                {
                    "last_affected":  "9.0"
                }
            ],
            "source":  "CPE_STRING",
            "vendor_product":  "debian:debian_linux"
        }
    ]
}
References

Affected packages

Git / github.com/exim/exim

Affected ranges

Type
GIT
Repo
https://github.com/exim/exim
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
062990cc1b2f9e5d82a413b53c8f0569075de700
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "4.90.1"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

Other
DEVEL_PDKIM_START
exim-4_50
exim-4_51
exim-4_52
exim-4_53
exim-4_54
exim-4_61
exim-4_62
exim-4_63
exim-4_64
exim-4_65
exim-4_66
exim-4_67
exim-4_68
exim-4_69
exim-4_70
exim-4_70_RC3
exim-4_70_RC4
exim-4_71
exim-4_72
exim-4_72_RC1
exim-4_72_RC2
exim-4_73
exim-4_73_RC00
exim-4_73_RC1
exim-4_74
exim-4_74_RC1
exim-4_75
exim-4_75_RC1
exim-4_75_RC2
exim-4_75_RC3
exim-4_76
exim-4_76_RC1
exim-4_76_RC2
exim-4_77
exim-4_77_RC1
exim-4_77_RC2
exim-4_77_RC3
exim-4_77_RC4
exim-4_80
exim-4_80_RC1
exim-4_80_RC2
exim-4_80_RC3
exim-4_80_RC4
exim-4_80_RC5
exim-4_80_RC6
exim-4_80_RC7
exim-4_82
exim-4_82_RC1
exim-4_82_RC2
exim-4_82_RC3
exim-4_82_RC4
exim-4_82_RC5
exim-4_83
exim-4_83_RC1
exim-4_83_RC2
exim-4_83_RC3
exim-4_84
exim-4_84_RC1
exim-4_84_RC2
exim-4_85
exim-4_85_RC1
exim-4_85_RC2
exim-4_85_RC3
exim-4_85_RC4
exim-4_86
exim-4_86_RC1
exim-4_86_RC2
exim-4_86_RC3
exim-4_86_RC4
exim-4_86_RC5
exim-4_87
exim-4_87_RC1
exim-4_87_RC2
exim-4_87_RC3
exim-4_87_RC4
exim-4_87_RC5
exim-4_87_RC6
exim-4_87_RC7
exim-4_88
exim-4_88_RC1
exim-4_88_RC2
exim-4_88_RC3
exim-4_88_RC4
exim-4_88_RC5
exim-4_88_RC6
exim-4_89_RC1
exim-4_89_RC3
exim-4_90
exim-4_90_RC1
exim-4_90_RC2
exim-4_90_RC3
exim-4_90_RC4
exim-4.*
exim-4.90.0.22
exim-4.90.0.27
exim-4.90devstart

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-6789.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "122224066439306498454973631177314728388",
                "210469213499539750685364841753279363702",
                "310130664126710556834765260497258691414",
                "6805203262403384879653734729276640848",
                "305471110171980478227503339989024839730",
                "96132330816761905364820075878497895364",
                "67183745914449294531187667849448072066"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2018-6789-73a6114c",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/exim/exim/commit/062990cc1b2f9e5d82a413b53c8f0569075de700",
        "target":  {
            "file":  "src/src/base64.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "277874649775681361413437847669575739043",
            "length":  1076
        },
        "id":  "CVE-2018-6789-ab775a72",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/exim/exim/commit/062990cc1b2f9e5d82a413b53c8f0569075de700",
        "target":  {
            "file":  "src/src/base64.c",
            "function":  "b64decode"
        }
    }
]
vanir_signatures_modified 
"2026-08-18T11:19:18Z"