high
7.5
CWE
772
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-42340: DoS via memory leak with WebSocket connections

First published: Thu Oct 14 2021(Updated: )

Apache Tomcat is vulnerable to a denial of service, caused by a memory leak flaw in WebSocket connections. By sending a specially-crafted request using OutOfMemoryError, a remote attacker could exploit this vulnerability to cause a denial of service condition.

Credit: security@apache.org security@apache.org

Affected SoftwareAffected VersionHow to fix
redhat/pki-servlet-engine<1:9.0.50-1.el9
1:9.0.50-1.el9
redhat/jws5-tomcat<0:9.0.50-3.redhat_00004.1.el7
0:9.0.50-3.redhat_00004.1.el7
redhat/jws5-tomcat-native<0:1.2.30-3.redhat_3.el7
0:1.2.30-3.redhat_3.el7
redhat/jws5-tomcat-vault<0:1.1.8-4.Final_redhat_00004.1.el7
0:1.1.8-4.Final_redhat_00004.1.el7
redhat/jws5-tomcat<0:9.0.50-3.redhat_00004.1.el8
0:9.0.50-3.redhat_00004.1.el8
redhat/jws5-tomcat-native<0:1.2.30-3.redhat_3.el8
0:1.2.30-3.redhat_3.el8
redhat/jws5-tomcat-vault<0:1.1.8-4.Final_redhat_00004.1.el8
0:1.1.8-4.Final_redhat_00004.1.el8
debian/tomcat9
9.0.31-1~deb10u6
9.0.31-1~deb10u10
9.0.43-2~deb11u6
9.0.43-2~deb11u9
9.0.70-2
maven/org.apache.tomcat:tomcat>=8.5.60<8.5.72
8.5.72
maven/org.apache.tomcat:tomcat>=9.0.40<9.0.54
9.0.54
maven/org.apache.tomcat:tomcat>=10.0.0-M1<10.0.12
10.0.12
maven/org.apache.tomcat:tomcat>=10.1.0-M1<=10.1.0-M5
10.1.0-M6
redhat/tomcat<10.1.0
10.1.0
redhat/tomcat<10.0.12
10.0.12
redhat/tomcat<9.0.54
9.0.54
redhat/tomcat<8.5.72
8.5.72
Apache Tomcat>=8.5.60<8.5.72
Apache Tomcat>=9.0.40<9.0.54
Apache Tomcat>=10.0.1<10.0.12
Apache Tomcat=10.0.0-milestone10
Apache Tomcat=10.1.0-milestone1
Apache Tomcat=10.1.0-milestone2
Apache Tomcat=10.1.0-milestone3
Apache Tomcat=10.1.0-milestone4
Apache Tomcat=10.1.0-milestone5
Netapp Hci
Netapp Management Services For Element Software
Debian Debian Linux=11.0
Oracle Agile Engineering Data Management=6.2.1.0
Oracle Big Data Spatial And Graph<23.1
Oracle Communications Diameter Signaling Router>=8.0.0.0<=8.5.0.2
Oracle Hospitality Cruise Shipboard Property Management System=20.1.0
Oracle Managed File Transfer=12.2.1.3.0
Oracle Managed File Transfer=12.2.1.4.0
Oracle Middleware Common Libraries And Tools=12.2.1.4.0
Oracle Payment Interface=19.1
Oracle Payment Interface=20.3
Oracle Retail Customer Insights=15.0.2
Oracle Retail Customer Insights=16.0.2
Oracle Retail Data Extractor For Merchandising=15.0.2
Oracle Retail Data Extractor For Merchandising=16.0.2
Oracle Retail Eftlink=21.0.0
Oracle Retail Financial Integration=16.0.1
Oracle Retail Financial Integration=19.0.0
Oracle Retail Store Inventory Management=14.0.4.13
Oracle Retail Store Inventory Management=14.1.3.5
Oracle Retail Store Inventory Management=14.1.3.14
Oracle Retail Store Inventory Management=15.0.3.3
Oracle Retail Store Inventory Management=15.0.3.8
Oracle Retail Store Inventory Management=16.0.3.7
Oracle SD-WAN Edge=9.0
Oracle SD-WAN Edge=9.1
Oracle Taleo Platform
IBM QRadar SIEM<=7.5.0 GA
IBM QRadar SIEM<=7.4.3 GA - 7.4.3 FP4
IBM QRadar SIEM<=7.3.3 GA - 7.3.3 FP10

Remedy

https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784@%3Ccommits.myfaces.apache.org%3E

Remedy

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

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

https://www.oracle.com/security-alerts/cpujul2022.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-42340?

    CVE-2021-42340 is a vulnerability in Apache Tomcat that allows for a denial of service attack caused by a memory leak flaw in WebSocket connections.

  • What is the severity of CVE-2021-42340?

    CVE-2021-42340 has a severity level of high.

  • Which versions of Apache Tomcat are affected by CVE-2021-42340?

    Apache Tomcat versions 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53, and 8.5.60 to 8.5.71 are affected by CVE-2021-42340.

  • What is the fix for CVE-2021-42340?

    The fix for CVE-2021-42340 is available in Apache Tomcat 10.1.0-M6, 10.0.12, 9.0.54, and 8.5.72.

  • How can I mitigate the vulnerability?

    To mitigate the vulnerability, it is recommended to update Apache Tomcat to versions 10.1.0-M6, 10.0.12, 9.0.54, or 8.5.72.

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