CVE-2018-6789 (GCVE-0-2018-6789)
Vulnerability from cvelistv5 – Published: 2018-02-08 23:00 – Updated: 2025-10-21 23:45Summary
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)
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
References
14 references
Date Public
2018-02-07 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 98d9b7ab-2de0-4486-bfe4-f1d955120cb5
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Exim Buffer Overflow Vulnerability | Affected: Exim / Exim | Description: Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2018-6789
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-119 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Exim |
| Due Date | 2022-05-03 |
| Date Added | 2021-11-03 |
| Vendorproject | Exim |
| Vulnerabilityname | Exim Buffer Overflow Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 13:26 UTC
| Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 37f6e986-0eee-429b-aabb-7c40c9727a88
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: 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... | Affected: Exim / Exim | CVSS: 9.8 (CRITICAL) | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | 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... |
| Vendor | Exim |
| Product | Exim |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | None |
| Cvss Severity | CRITICAL |
| Epss Percentile | None |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T06:10:11.343Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK",
"x_transferred"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB",
"x_transferred"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"tags": [
"vdb-entry",
"x_refsource_BID",
"x_transferred"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB",
"x_transferred"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"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"
}
},
{
"other": {
"content": {
"id": "CVE-2018-6789",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-02-07T14:03:40.827397Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-21T23:45:56.260Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2018-6789 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"datePublic": "2018-02-07T00:00:00.000Z",
"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."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-06-03T17:06:14.000Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"tags": [
"vdb-entry",
"x_refsource_BID"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "cve@mitre.org",
"ID": "CVE-2018-6789",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"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."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://exim.org/static/doc/security/CVE-2018-6789.txt",
"refsource": "CONFIRM",
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"name": "http://openwall.com/lists/oss-security/2018/02/10/2",
"refsource": "CONFIRM",
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"refsource": "SECTRACK",
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"refsource": "EXPLOIT-DB",
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"name": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1",
"refsource": "CONFIRM",
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"name": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
"refsource": "MISC",
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"refsource": "BID",
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"refsource": "EXPLOIT-DB",
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"name": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2018-6789",
"datePublished": "2018-02-08T23:00:00.000Z",
"dateReserved": "2018-02-06T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:45:56.260Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2018-6789",
"cwes": [
"CWE-119"
],
"dateAdded": "2021-11-03",
"dueDate": "2022-05-03",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2018-6789",
"product": "Exim",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.",
"vendorProject": "Exim",
"vulnerabilityName": "Exim Buffer Overflow Vulnerability"
},
"epss": {
"cve": "CVE-2018-6789",
"date": "2026-09-20",
"epss": "0.82137",
"percentile": "0.99639"
},
"nvd": {
"cve": {
"cisaActionDue": "2022-05-03",
"cisaExploitAdd": "2021-11-03",
"cisaRequiredAction": "Apply updates per vendor instructions.",
"cisaVulnerabilityName": "Exim Buffer Overflow Vulnerability",
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*",
"matchCriteriaId": "EC35DD1C-8421-443D-9EBC-73F1C7B7306E",
"versionEndExcluding": "4.90.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"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:*:*:*",
"matchCriteriaId": "815D70A8-47D3-459C-A32C-9FEACA0659D1",
"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": "2025-11-07T19:04:28.453",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"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": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
},
"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",
"tags": [
"Broken Link",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"source": "cve@mitre.org",
"tags": [
"Broken Link",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"source": "cve@mitre.org",
"tags": [
"Vendor Advisory"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"source": "cve@mitre.org",
"tags": [
"Patch"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"source": "cve@mitre.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Broken Link",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Broken Link",
"Third Party Advisory",
"VDB Entry"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory",
"VDB Entry"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-120"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-120"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Critical",
"current_release_date": "2026-01-09T09:05:19+00:00",
"cve": "CVE-2018-6789",
"id": "CVE-2018-6789",
"initial_release_date": "2018-02-07T00:00:00+00:00",
"product_status:known_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "exim: buffer overflow in b64decode() function, possibly leading to remote code execution",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-6789.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T06:10:11.343Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK",
"x_transferred"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB",
"x_transferred"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"tags": [
"vdb-entry",
"x_refsource_BID",
"x_transferred"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB",
"x_transferred"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"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"
}
},
{
"other": {
"content": {
"id": "CVE-2018-6789",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-02-07T14:03:40.827397Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-02-07T14:03:34.340Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2018-6789 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"datePublic": "2018-02-07T00:00:00.000Z",
"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."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-06-03T17:06:14.000Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"tags": [
"vdb-entry",
"x_refsource_SECTRACK"
],
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB"
],
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"tags": [
"vdb-entry",
"x_refsource_BID"
],
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"tags": [
"exploit",
"x_refsource_EXPLOIT-DB"
],
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "cve@mitre.org",
"ID": "CVE-2018-6789",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"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."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://exim.org/static/doc/security/CVE-2018-6789.txt",
"refsource": "CONFIRM",
"url": "https://exim.org/static/doc/security/CVE-2018-6789.txt"
},
{
"name": "[oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2018/02/07/2"
},
{
"name": "USN-3565-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/3565-1/"
},
{
"name": "http://openwall.com/lists/oss-security/2018/02/10/2",
"refsource": "CONFIRM",
"url": "http://openwall.com/lists/oss-security/2018/02/10/2"
},
{
"name": "1040461",
"refsource": "SECTRACK",
"url": "http://www.securitytracker.com/id/1040461"
},
{
"name": "DSA-4110",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2018/dsa-4110"
},
{
"name": "44571",
"refsource": "EXPLOIT-DB",
"url": "https://www.exploit-db.com/exploits/44571/"
},
{
"name": "[debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"
},
{
"name": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1",
"refsource": "CONFIRM",
"url": "https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"
},
{
"name": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/",
"refsource": "MISC",
"url": "https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"
},
{
"name": "103049",
"refsource": "BID",
"url": "http://www.securityfocus.com/bid/103049"
},
{
"name": "45671",
"refsource": "EXPLOIT-DB",
"url": "https://www.exploit-db.com/exploits/45671/"
},
{
"name": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2018-6789",
"datePublished": "2018-02-08T23:00:00.000Z",
"dateReserved": "2018-02-06T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:45:56.260Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
Loading…
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.
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.
Loading…
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.
Loading…