CVE-2018-6789

Exim Buffer Overflow Vulnerability

n/a

CVSS

82.1%

EPSS (exploit prob.)

99.6%

EPSS percentile

Yes

Actively exploited

Yes

Ransomware use

2021-11-03

Added

MITRE ATT&CK techniques

How this vulnerability maps to adversary behaviour, from the Center for Threat-Informed Defense's public CVE→ATT&CK mappings. Use it to check whether your detections already cover the technique.

Technique	Name	Relationship
T1190	Exploit Public-Facing Application	exploitation technique
T1059	Command and Scripting Interpreter	primary impact

Summary

Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.

Affected software

Vendor: Exim · Product: Exim

Weakness types (CWE):

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

Related vulnerabilities in Exim

CVE	Name	EPSS	Exploited
CVE-2019-10149	Exim Mail Transfer Agent (MTA) Improper Input Validation	100.0%	Yes
CVE-2010-4344	Exim Heap-Based Buffer Overflow Vulnerability	71.9%	Yes
CVE-2019-16928	Exim Out-of-bounds Write Vulnerability	41.6%	Yes
CVE-2010-4345	Exim Privilege Escalation Vulnerability	18.1%	Yes

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