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CVE-2018-6789: Exim Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2018-6789
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.

CSIRTS triage

vendor: Eximproduct: EximRemote code execution
What
Exim contains a buffer overflow vulnerability that may allow remote code execution.
Who is affected
Users of Exim are affected by this vulnerability.
Urgency
This critical vulnerability is actively exploited, requiring immediate remediation.
Action
Update to the latest version of Exim.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2018-6789

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2018-6789coverage & exploitation statusNVD · CVE.org

Recent advisories for Exim Buffer Overflow

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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