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CVE-2020-9488

LowPublished

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender. This could allow an SMTPS connection to be intercepted by a...

Published: Apr 27, 2020
Updated: May 29, 2026
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

3.7/ 10Low

nvd · CVSS 3.1

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

EPSS probability estimate

8.1%

Low · next 30 days

Percentile: 94.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender. This could allow an SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent through that appender. Fixed in Apache Log4j 2.12.3 and 2.13.1

Sources

java-log4j-cve-2020-9488Research
Demo of CVE-2020-9488: Unsafe logging with Log4j and remediation

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