CVE-2020-9488: Log4j Improper Validation Of Certificate With Vulnerability

Q: What is CVE-2020-9488?

CVE-2020-9488 is a security vulnerability in Log4j involving Improper validation of certificate with host mismatch in Apache Log4j SMTP appender under CWE-295: Improper Certificate Validation.

Q: Which Log4j versions are affected?

Affected versions include releases prior to 2.13.2, 2.12.3, 2.3.2 across affected packages: org.apache.logging.log4j:log4j, org.apache.logging.log4j:log4j-core.

Q: What version fixes CVE-2020-9488?

Upgrading to 2.13.2, 2.12.3, 2.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is log4j affected?

Yes, org.apache.logging.log4j:log4j is affected in releases prior to 2.13.2, 2.12.3, 2.3.2. Upgrade your dependency to 2.13.2, 2.12.3, 2.3.2 or later.

Q: Is log4j-core affected?

Yes, org.apache.logging.log4j:log4j-core is affected in releases prior to 2.13.2, 2.12.3, 2.3.2. Upgrade your dependency to 2.13.2, 2.12.3, 2.3.2 or later.

Q: What is the CVSS score of CVE-2020-9488?

CVE-2020-9488 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Q: What CWE is associated with CVE-2020-9488?

CVE-2020-9488 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).

Q: How can I check Maven dependencies for CVE-2020-9488?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.logging.log4j'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

LOW

Advisory Identifier: GHSA-vwqq-5vrc-xw9h

CVSS 3.7

CWE-295

Published 2020-06-05

Advisory Summary

CVE-2020-9488 is a LOW (CVSS 3.7) improper validation of certificate with vulnerability (CWE-295: Improper Certificate Validation) affecting Log4j libraries in the Maven ecosystem. The issue involves improper validation of certificate with host mismatch in apache log4j smtp appender. Remediation is available by upgrading affected packages to version 2.13.2, 2.12.3, 2.3.2.

CVE-2020-9488 at a Glance

CVE Identifier CVE-2020-9488

GHSA Identifier GHSA-vwqq-5vrc-xw9h

Severity LOW

CVSS v3.1 Base Score 3.7

CWE Classification CWE-295: Improper Certificate Validation

Affected Product Log4j

Package Ecosystem Maven

Published Date 2020-06-05

Last Updated 2026-06-09

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)

Attack Complexity High (AC:H)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

How to Fix CVE-2020-9488

To remediate this vulnerability, upgrade all affected Log4j dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.logging.log4j:log4j fixed: 2.13.2

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>2.13.2</version>
</dependency>

org.apache.logging.log4j:log4j-core fixed: 2.13.2

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.13.2</version>
</dependency>

org.apache.logging.log4j:log4j fixed: 2.12.3

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>2.12.3</version>
</dependency>

org.apache.logging.log4j:log4j fixed: 2.3.2

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>2.3.2</version>
</dependency>

org.apache.logging.log4j:log4j-core fixed: 2.12.3

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.12.3</version>
</dependency>

org.apache.logging.log4j:log4j-core fixed: 2.3.2

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.3.2</version>
</dependency>

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree -Dincludes=org.apache.logging.log4j

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-9488, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.logging.log4j

Analyze the terminal output to locate any version of Log4j in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.13.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.logging.log4j command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Log4j, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender prior to version 2.13.2. 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.

CVE-2020-9488 Affected Log4j Versions

6 component(s)

Fixed Versions:

2.13.22.12.32.3.2

Product / Package	Ecosystem	Affected Versions	Fixed Version
org.apache.logging.log4j:log4j maven/org.apache.logging.log4j/log4j	Maven	≥ 2.13.0 < 2.13.2	2.13.2
org.apache.logging.log4j:log4j-core maven/org.apache.logging.log4j/log4j-core	Maven	≥ 2.13.0 < 2.13.2	2.13.2
org.apache.logging.log4j:log4j maven/org.apache.logging.log4j/log4j	Maven	≥ 2.4.0 < 2.12.3	2.12.3
org.apache.logging.log4j:log4j maven/org.apache.logging.log4j/log4j	Maven	< 2.3.2	2.3.2
org.apache.logging.log4j:log4j-core maven/org.apache.logging.log4j/log4j-core	Maven	≥ 2.4.0 < 2.12.3	2.12.3
org.apache.logging.log4j:log4j-core maven/org.apache.logging.log4j/log4j-core	Maven	< 2.3.2	2.3.2

References

NVD — CVE-2020-9488 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-9488

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Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpuoct2021.html

Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpuoct2020.html

Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpujul2020.html

Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpujan2021.html

Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpuapr2022.html

Log4j Security Information SECURITY

https://www.oracle.com/security-alerts/cpuApr2021.html

Log4j Security Information SECURITY

https://www.debian.org/security/2021/dsa-5020

Log4j Security Information SECURITY

https://security.netapp.com/advisory/ntap-20200504-0003

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Frequently Asked Questions

What is CVE-2020-9488?

CVE-2020-9488 is a security vulnerability in Log4j involving Improper validation of certificate with host mismatch in Apache Log4j SMTP appender under CWE-295: Improper Certificate Validation.

Which Log4j versions are affected?

Affected versions include releases prior to 2.13.2, 2.12.3, 2.3.2 across affected packages: org.apache.logging.log4j:log4j, org.apache.logging.log4j:log4j-core.

What version fixes CVE-2020-9488?

Upgrading to 2.13.2, 2.12.3, 2.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Is log4j affected?

Yes, org.apache.logging.log4j:log4j is affected in releases prior to 2.13.2, 2.12.3, 2.3.2. Upgrade your dependency to 2.13.2, 2.12.3, 2.3.2 or later.

Is log4j-core affected?

Yes, org.apache.logging.log4j:log4j-core is affected in releases prior to 2.13.2, 2.12.3, 2.3.2. Upgrade your dependency to 2.13.2, 2.12.3, 2.3.2 or later.

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

CVE-2020-9488 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

What CWE is associated with CVE-2020-9488?

CVE-2020-9488 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).

How can I check Maven dependencies for CVE-2020-9488?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.logging.log4j'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vwqq-5vrc-xw9h",
  "modified" : "2026-06-09T10:30:05Z",
  "published" : "2020-06-05T14:15:51Z",
  "aliases" : [ "CVE-2020-9488" ],
  "summary" : "Improper validation of certificate with host mismatch in Apache Log4j SMTP appender",
  "details" : "Improper validation of certificate with host mismatch in Apache Log4j SMTP appender prior to version 2.13.2. 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.logging.log4j:log4j"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.13.0"
      }, {
        "fixed" : "2.13.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.logging.log4j:log4j-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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        "introduced" : "2.4.0"
      }, {
        "fixed" : "2.12.3"
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  }, {
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      "name" : "org.apache.logging.log4j:log4j"
    },
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      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.2"
      } ]
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  }, {
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  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-9488"
  }, {
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  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-04T19:29:20Z",
    "nvd_published_at" : "2020-04-27T16:15:00Z"
  }
}

CVSS V3

3.7 LOW

Attack Vector Network (AV:N)

Attack Complexity High (AC:H)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality Low (C:L)

Integrity None (I:N)

Availability None (A:N)

Vector String

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

Advisory Metadata

Source ID: GHSA-vwqq-5vrc-xw9h
Schema Version: 1.4.0
Published: 2020-06-05 14:15
Last Modified: 2026-06-09 10:30
Database Record File: advisories/github-reviewed/2020/06/GHSA-vwqq-5vrc-xw9h/GHSA-vwqq-5vrc-xw9h.json