medium
4.3
Advisory Published
CVE Published
Updated

CVE-2021-2341

First published: Thu Jul 15 2021(Updated: )

A flaw was found in the way the FtpClient implementation in the Networking component of OpenJDK handled responses to the FTP PASV command. A malicious FTP server could cause a Java application using FtpClient to connect to a host and port that is not accessible from the FTP server and perform port scanning or banner extraction. The fix for this issue prevents FtpClient from connecting to hosts different form the server used for the main FTP connection. As this fix may break certain FTP deployments, a newly introduced system property jdk.net.ftp.trustPasvAddress can be used to make FtpClient connect to any host specified in the PASV command response.

Credit: secalert_us@oracle.com

Affected SoftwareAffected VersionHow to fix
debian/openjdk-11
11.0.16+8-1~deb10u1
11.0.20+8-1~deb10u1
11.0.20+8-1~deb11u1
11.0.21+9-1
debian/openjdk-8
8u382-ga-2
Oracle GraalVM=20.3.2
Oracle GraalVM=21.1.0
Oracle OpenJDK=7-update301
Oracle OpenJDK=8-update291
Oracle OpenJDK=11.0.11
Oracle OpenJDK=16.0.1
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=33
Fedoraproject Fedora=34
IBM Cloud Pak for Security (CP4S)<=1.7.2.0
IBM Cloud Pak for Security (CP4S)<=1.7.1.0
IBM Cloud Pak for Security (CP4S)<=1.7.0.0

Remedy

https://www.oracle.com/security-alerts/cpujul2021.html

Remedy

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

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-2341?

    CVE-2021-2341 is an unspecified vulnerability in Java SE related to the Networking component that could allow an unauthorized attacker to compromise the confidentiality, integrity, and availability of the affected system.

  • Which versions of Java SE are affected by CVE-2021-2341?

    Java SE versions 7u301, 8u291, 11.0.11, and 16.0.1 are affected by CVE-2021-2341.

  • Which versions of Oracle GraalVM Enterprise Edition are affected by CVE-2021-2341?

    Oracle GraalVM Enterprise Edition versions 20.3.2 and 21.1.0 are affected by CVE-2021-2341.

  • What is the severity of CVE-2021-2341?

    The severity of CVE-2021-2341 is medium, with a CVSS score of 3.1.

  • How can I mitigate the vulnerability CVE-2021-2341 in Java SE?

    To mitigate CVE-2021-2341, Oracle recommends patching to the following versions: 7u311, 8u301, 11.0.12, and 16.0.2.

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