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.
Published 2018-02-08 23:29:01
Updated 2021-06-03 18:15:08
Source MITRE
View at NVD,   CVE.org
Vulnerability category: OverflowExecute code

Threat overview for CVE-2018-6789

Top countries where our scanners detected CVE-2018-6789
Top open port discovered on systems with this issue 80
IPs affected by CVE-2018-6789 17,171
Threat actors abusing to this issue? Yes
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CVE-2018-6789 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Exim Buffer Overflow Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.
Added on 2021-11-03 Action due date 2022-05-03

Exploit prediction scoring system (EPSS) score for CVE-2018-6789

Probability of exploitation activity in the next 30 days: 96.86%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 100 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2018-6789

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
7.5
HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
nvd@nist.gov
9.8
CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
nvd@nist.gov

CWE ids for CVE-2018-6789

References for CVE-2018-6789

Products affected by CVE-2018-6789

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