Is CVE-2020-9488 in the CISA KEV catalog?

No. CVE-2020-9488 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-9488?

CVE-2020-9488 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2020-9488?

CVE-2020-9488 has an EPSS score of 7.81% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-9488?

Upgrade apache-log4j2 on debian 11 to 2.13.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-9488

LOWEPSS 94th pctl

3.7

CVSS v3

NVD

Description

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

CWE-295Improper Certificate Validation

How to fix

Remediation Available

apache-log4j2Debian

Fixed in:2.13.3-1CVE-2020-9488

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

7.81%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-29.