Vulnerability-Lookup

FKIE_CVE-2018-6789

Vulnerability from fkie_nvd - Published: 2018-02-08 23:29 - Updated: 2026-06-17 02:02

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

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.

References

URL	Tags
cve@mitre.org	http://openwall.com/lists/oss-security/2018/02/10/2	Mailing List, Third Party Advisory
cve@mitre.org	http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html	Exploit, Third Party Advisory, VDB Entry
cve@mitre.org	http://www.openwall.com/lists/oss-security/2018/02/07/2	Mailing List, Third Party Advisory
cve@mitre.org	http://www.securityfocus.com/bid/103049	Broken Link, Third Party Advisory, VDB Entry
cve@mitre.org	http://www.securitytracker.com/id/1040461	Broken Link, Third Party Advisory, VDB Entry
cve@mitre.org	https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/	Exploit, Third Party Advisory
cve@mitre.org	https://exim.org/static/doc/security/CVE-2018-6789.txt	Vendor Advisory
cve@mitre.org	https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1	Patch
cve@mitre.org	https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html	Mailing List, Third Party Advisory
cve@mitre.org	https://usn.ubuntu.com/3565-1/	Third Party Advisory
cve@mitre.org	https://www.debian.org/security/2018/dsa-4110	Mailing List, Third Party Advisory
cve@mitre.org	https://www.exploit-db.com/exploits/44571/	Exploit, Third Party Advisory, VDB Entry
cve@mitre.org	https://www.exploit-db.com/exploits/45671/	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	http://openwall.com/lists/oss-security/2018/02/10/2	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2018/02/07/2	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.securityfocus.com/bid/103049	Broken Link, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	http://www.securitytracker.com/id/1040461	Broken Link, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://exim.org/static/doc/security/CVE-2018-6789.txt	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://usn.ubuntu.com/3565-1/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.debian.org/security/2018/dsa-4110	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.exploit-db.com/exploits/44571/	Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	https://www.exploit-db.com/exploits/45671/	Exploit, Third Party Advisory, VDB Entry
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789	US Government Resource

Impacted products

Vendor	Product	Version
exim	exim	*
debian	debian_linux	7.0
debian	debian_linux	8.0
debian	debian_linux	9.0
canonical	ubuntu_linux	14.04
canonical	ubuntu_linux	16.04
canonical	ubuntu_linux	17.10

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cisaActionDue": "2022-05-03",
  "cisaExploitAdd": "2021-11-03",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Exim Buffer Overflow Vulnerability",
  "configurations": [
    {
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        {
          "cpeMatch": [
            {
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              "matchCriteriaId": "EC35DD1C-8421-443D-9EBC-73F1C7B7306E",
              "versionEndExcluding": "4.90.1",
              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
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              "criteria": "cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "16F59A04-14CF-49E2-9973-645477EA09DA",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*",
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              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
              "matchCriteriaId": "7A5301BF-1402-4BE0-A0F8-69FBE79BC6D6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*",
              "matchCriteriaId": "9070C9D8-A14A-467F-8253-33B966C16886",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Se ha descubierto un problema en la funci\u00f3n base64d en el escuchador SMTP en Exim, en versiones anteriores a la 4.90.1. Al enviar un mensaje manipulado, podr\u00eda ocurrir un desbordamiento de b\u00fafer. Esto puede emplearse para ejecutar c\u00f3digo de forma remota."
    }
  ],
  "id": "CVE-2018-6789",
  "lastModified": "2026-06-17T02:02:17.180",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
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          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "cvssData": {
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          "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",
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          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2018-6789",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-07T14:03:40.827397Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2018-02-08T23:29:01.170",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://openwall.com/lists/oss-security/2018/02/10/2"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
    },
    {
      "source": "cve@mitre.org",
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        "Third Party Advisory",
        "VDB Entry"
      ],
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    {
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      "tags": [
        "Broken Link",
        "Third Party Advisory",
        "VDB Entry"
      ],
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    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
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    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
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    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
      "url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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        "Third Party Advisory"
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      "url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
    },
    {
      "source": "cve@mitre.org",
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        "Third Party Advisory"
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      "url": "https://usn.ubuntu.com/3565-1/"
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    {
      "source": "cve@mitre.org",
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    {
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    {
      "source": "cve@mitre.org",
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      "tags": [
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    },
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      "tags": [
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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        "Third Party Advisory"
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    },
    {
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    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
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          "value": "CWE-120"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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  ]
}

CVE-2018-6789 (GCVE-0-2018-6789)

Vulnerability from cvelistv5 – Published: 2018-02-08 23:00 – Updated: 2025-10-21 23:45

Summary

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.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: active Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-07 14:03 UTC

CWE

n/a
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

mitre mitre root

References

14 references

URL	Tags
https://exim.org/static/doc/security/CVE-2018-6789.txt	x_refsource_CONFIRM
http://www.openwall.com/lists/oss-security/2018/02/07/2	mailing-listx_refsource_MLIST
https://usn.ubuntu.com/3565-1/	vendor-advisoryx_refsource_UBUNTU
http://openwall.com/lists/oss-security/2018/02/10/2	x_refsource_CONFIRM
http://www.securitytracker.com/id/1040461	vdb-entryx_refsource_SECTRACK
https://www.debian.org/security/2018/dsa-4110	vendor-advisoryx_refsource_DEBIAN
https://www.exploit-db.com/exploits/44571/	exploitx_refsource_EXPLOIT-DB
https://lists.debian.org/debian-lts-announce/2018…	mailing-listx_refsource_MLIST
https://git.exim.org/exim.git/commit/cf3cd306062a…	x_refsource_CONFIRM
https://devco.re/blog/2018/03/06/exim-off-by-one-…	x_refsource_MISC
http://www.securityfocus.com/bid/103049	vdb-entryx_refsource_BID
https://www.exploit-db.com/exploits/45671/	exploitx_refsource_EXPLOIT-DB
http://packetstormsecurity.com/files/162959/Exim-…	x_refsource_MISC
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Date Public

2018-02-07 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T06:10:11.343Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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              "x_transferred"
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            "url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
          },
          {
            "tags": [
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              "x_transferred"
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            "url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.