CVE-2021-20220: XSS

Published Feb 1, 2021
·
Updated

A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.

Other sources

A regression issue reintroduced undertow's CVE-2020-10687 after undertow 2.0.30.SP4.

— Red Hat

Affected Software

57 affected componentsFixes available
redhat/eap7-activemq-artemis<0:2.9.0-9.redhat_00019.1.el6ea
0:2.9.0-9.redhat_00019.1.el6ea
redhat/eap7-bouncycastle<0:1.68.0-1.redhat_00001.1.el6ea
0:1.68.0-1.redhat_00001.1.el6ea
redhat/eap7-guava-failureaccess<0:1.0.1-1.redhat_00002.1.el6ea
0:1.0.1-1.redhat_00002.1.el6ea
redhat/eap7-guava-libraries<0:30.1.0-1.redhat_00001.1.el6ea
0:30.1.0-1.redhat_00001.1.el6ea
redhat/eap7-hal-console<0:3.2.13-1.Final_redhat_00001.1.el6ea
0:3.2.13-1.Final_redhat_00001.1.el6ea
redhat/eap7-ironjacamar<0:1.4.27-1.Final_redhat_00001.1.el6ea
0:1.4.27-1.Final_redhat_00001.1.el6ea
redhat/eap7-jboss-ejb-client<0:4.0.39-1.SP1_redhat_00001.1.el6ea
0:4.0.39-1.SP1_redhat_00001.1.el6ea
redhat/eap7-jboss-logmanager<0:2.1.18-1.Final_redhat_00001.1.el6ea
0:2.1.18-1.Final_redhat_00001.1.el6ea
redhat/eap7-jboss-remoting<0:5.0.20-2.SP1_redhat_00001.1.el6ea
0:5.0.20-2.SP1_redhat_00001.1.el6ea
redhat/eap7-jboss-server-migration<0:1.7.2-5.Final_redhat_00006.1.el6ea
0:1.7.2-5.Final_redhat_00006.1.el6ea
redhat/eap7-narayana<0:5.9.11-1.Final_redhat_00001.1.el6ea
0:5.9.11-1.Final_redhat_00001.1.el6ea
redhat/eap7-undertow<0:2.0.34-1.SP1_redhat_00001.1.el6ea
0:2.0.34-1.SP1_redhat_00001.1.el6ea
redhat/eap7-wildfly<0:7.3.6-1.GA_redhat_00002.1.el6ea
0:7.3.6-1.GA_redhat_00002.1.el6ea
redhat/eap7-wildfly-elytron<0:1.10.11-1.Final_redhat_00001.1.el6ea
0:1.10.11-1.Final_redhat_00001.1.el6ea
redhat/eap7-wildfly-http-client<0:1.0.25-1.Final_redhat_00001.1.el6ea
0:1.0.25-1.Final_redhat_00001.1.el6ea
redhat/eap7-wildfly-naming-client<0:1.0.14-1.Final_redhat_00001.1.el6ea
0:1.0.14-1.Final_redhat_00001.1.el6ea
redhat/eap7-activemq-artemis<0:2.9.0-9.redhat_00019.1.el7ea
0:2.9.0-9.redhat_00019.1.el7ea
redhat/eap7-bouncycastle<0:1.68.0-1.redhat_00001.1.el7ea
0:1.68.0-1.redhat_00001.1.el7ea
redhat/eap7-guava-failureaccess<0:1.0.1-1.redhat_00002.1.el7ea
0:1.0.1-1.redhat_00002.1.el7ea
redhat/eap7-guava-libraries<0:30.1.0-1.redhat_00001.1.el7ea
0:30.1.0-1.redhat_00001.1.el7ea
redhat/eap7-hal-console<0:3.2.13-1.Final_redhat_00001.1.el7ea
0:3.2.13-1.Final_redhat_00001.1.el7ea
redhat/eap7-ironjacamar<0:1.4.27-1.Final_redhat_00001.1.el7ea
0:1.4.27-1.Final_redhat_00001.1.el7ea
redhat/eap7-jboss-ejb-client<0:4.0.39-1.SP1_redhat_00001.1.el7ea
0:4.0.39-1.SP1_redhat_00001.1.el7ea
redhat/eap7-jboss-logmanager<0:2.1.18-1.Final_redhat_00001.1.el7ea
0:2.1.18-1.Final_redhat_00001.1.el7ea
redhat/eap7-jboss-remoting<0:5.0.20-2.SP1_redhat_00001.1.el7ea
0:5.0.20-2.SP1_redhat_00001.1.el7ea
redhat/eap7-jboss-server-migration<0:1.7.2-5.Final_redhat_00006.1.el7ea
0:1.7.2-5.Final_redhat_00006.1.el7ea
redhat/eap7-narayana<0:5.9.11-1.Final_redhat_00001.1.el7ea
0:5.9.11-1.Final_redhat_00001.1.el7ea
redhat/eap7-undertow<0:2.0.34-1.SP1_redhat_00001.1.el7ea
0:2.0.34-1.SP1_redhat_00001.1.el7ea
redhat/eap7-wildfly<0:7.3.6-1.GA_redhat_00002.1.el7ea
0:7.3.6-1.GA_redhat_00002.1.el7ea
redhat/eap7-wildfly-elytron<0:1.10.11-1.Final_redhat_00001.1.el7ea
0:1.10.11-1.Final_redhat_00001.1.el7ea
redhat/eap7-wildfly-http-client<0:1.0.25-1.Final_redhat_00001.1.el7ea
0:1.0.25-1.Final_redhat_00001.1.el7ea
redhat/eap7-wildfly-naming-client<0:1.0.14-1.Final_redhat_00001.1.el7ea
0:1.0.14-1.Final_redhat_00001.1.el7ea
redhat/eap7-activemq-artemis<0:2.9.0-9.redhat_00019.1.el8ea
0:2.9.0-9.redhat_00019.1.el8ea
redhat/eap7-bouncycastle<0:1.68.0-1.redhat_00001.1.el8ea
0:1.68.0-1.redhat_00001.1.el8ea
redhat/eap7-guava-failureaccess<0:1.0.1-1.redhat_00002.1.el8ea
0:1.0.1-1.redhat_00002.1.el8ea
redhat/eap7-guava-libraries<0:30.1.0-1.redhat_00001.1.el8ea
0:30.1.0-1.redhat_00001.1.el8ea
redhat/eap7-hal-console<0:3.2.13-1.Final_redhat_00001.1.el8ea
0:3.2.13-1.Final_redhat_00001.1.el8ea
redhat/eap7-ironjacamar<0:1.4.27-1.Final_redhat_00001.1.el8ea
0:1.4.27-1.Final_redhat_00001.1.el8ea
redhat/eap7-jboss-ejb-client<0:4.0.39-1.SP1_redhat_00001.1.el8ea
0:4.0.39-1.SP1_redhat_00001.1.el8ea
redhat/eap7-jboss-logmanager<0:2.1.18-1.Final_redhat_00001.1.el8ea
0:2.1.18-1.Final_redhat_00001.1.el8ea
redhat/eap7-jboss-remoting<0:5.0.20-2.SP1_redhat_00001.1.el8ea
0:5.0.20-2.SP1_redhat_00001.1.el8ea
redhat/eap7-jboss-server-migration<0:1.7.2-5.Final_redhat_00006.1.el8ea
0:1.7.2-5.Final_redhat_00006.1.el8ea
redhat/eap7-narayana<0:5.9.11-1.Final_redhat_00001.1.el8ea
0:5.9.11-1.Final_redhat_00001.1.el8ea
redhat/eap7-undertow<0:2.0.34-1.SP1_redhat_00001.1.el8ea
0:2.0.34-1.SP1_redhat_00001.1.el8ea
redhat/eap7-wildfly<0:7.3.6-1.GA_redhat_00002.1.el8ea
0:7.3.6-1.GA_redhat_00002.1.el8ea
redhat/eap7-wildfly-elytron<0:1.10.11-1.Final_redhat_00001.1.el8ea
0:1.10.11-1.Final_redhat_00001.1.el8ea
redhat/eap7-wildfly-http-client<0:1.0.25-1.Final_redhat_00001.1.el8ea
0:1.0.25-1.Final_redhat_00001.1.el8ea
redhat/eap7-wildfly-naming-client<0:1.0.14-1.Final_redhat_00001.1.el8ea
0:1.0.14-1.Final_redhat_00001.1.el8ea
redhat/Undertow<2.2.0.
2.2.0.
redhat/Undertow<2.1.6.
2.1.6.
redhat/Undertow<2.0.34.
2.0.34.
redhat undertow<2.0.34
redhat undertow>=2.1.0<2.1.6
NetApp Active Iq Unified Manager Linux
NetApp Active Iq Unified Manager Vmware Vsphere
NetApp Active Iq Unified Manager Windows
NetApp OnCommand Workflow Automation

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/eap7-activemq-artemis to a version that resolves this vulnerability.

    Fixed in 0:2.9.0-9.redhat_00019.1.el6ea
  2. Upgrade

    Upgrade redhat/eap7-bouncycastle to a version that resolves this vulnerability.

    Fixed in 0:1.68.0-1.redhat_00001.1.el6ea
  3. Upgrade

    Upgrade redhat/eap7-guava-failureaccess to a version that resolves this vulnerability.

    Fixed in 0:1.0.1-1.redhat_00002.1.el6ea
  4. Upgrade

    Upgrade redhat/eap7-guava-libraries to a version that resolves this vulnerability.

    Fixed in 0:30.1.0-1.redhat_00001.1.el6ea
  5. Upgrade

    Upgrade redhat/eap7-hal-console to a version that resolves this vulnerability.

    Fixed in 0:3.2.13-1.Final_redhat_00001.1.el6ea
  6. Upgrade

    Upgrade redhat/eap7-ironjacamar to a version that resolves this vulnerability.

    Fixed in 0:1.4.27-1.Final_redhat_00001.1.el6ea
  7. Upgrade

    Upgrade redhat/eap7-jboss-ejb-client to a version that resolves this vulnerability.

    Fixed in 0:4.0.39-1.SP1_redhat_00001.1.el6ea
  8. Upgrade

    Upgrade redhat/eap7-jboss-logmanager to a version that resolves this vulnerability.

    Fixed in 0:2.1.18-1.Final_redhat_00001.1.el6ea
  9. Upgrade

    Upgrade redhat/eap7-jboss-remoting to a version that resolves this vulnerability.

    Fixed in 0:5.0.20-2.SP1_redhat_00001.1.el6ea
  10. Upgrade

    Upgrade redhat/eap7-jboss-server-migration to a version that resolves this vulnerability.

    Fixed in 0:1.7.2-5.Final_redhat_00006.1.el6ea
  11. Upgrade

    Upgrade redhat/eap7-narayana to a version that resolves this vulnerability.

    Fixed in 0:5.9.11-1.Final_redhat_00001.1.el6ea
  12. Upgrade

    Upgrade redhat/eap7-undertow to a version that resolves this vulnerability.

    Fixed in 0:2.0.34-1.SP1_redhat_00001.1.el6ea
  13. Upgrade

    Upgrade redhat/eap7-wildfly to a version that resolves this vulnerability.

    Fixed in 0:7.3.6-1.GA_redhat_00002.1.el6ea
  14. Upgrade

    Upgrade redhat/eap7-wildfly-elytron to a version that resolves this vulnerability.

    Fixed in 0:1.10.11-1.Final_redhat_00001.1.el6ea
  15. Upgrade

    Upgrade redhat/eap7-wildfly-http-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.25-1.Final_redhat_00001.1.el6ea
  16. Upgrade

    Upgrade redhat/eap7-wildfly-naming-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.14-1.Final_redhat_00001.1.el6ea
  17. Upgrade

    Upgrade redhat/eap7-activemq-artemis to a version that resolves this vulnerability.

    Fixed in 0:2.9.0-9.redhat_00019.1.el7ea
  18. Upgrade

    Upgrade redhat/eap7-bouncycastle to a version that resolves this vulnerability.

    Fixed in 0:1.68.0-1.redhat_00001.1.el7ea
  19. Upgrade

    Upgrade redhat/eap7-guava-failureaccess to a version that resolves this vulnerability.

    Fixed in 0:1.0.1-1.redhat_00002.1.el7ea
  20. Upgrade

    Upgrade redhat/eap7-guava-libraries to a version that resolves this vulnerability.

    Fixed in 0:30.1.0-1.redhat_00001.1.el7ea
  21. Upgrade

    Upgrade redhat/eap7-hal-console to a version that resolves this vulnerability.

    Fixed in 0:3.2.13-1.Final_redhat_00001.1.el7ea
  22. Upgrade

    Upgrade redhat/eap7-ironjacamar to a version that resolves this vulnerability.

    Fixed in 0:1.4.27-1.Final_redhat_00001.1.el7ea
  23. Upgrade

    Upgrade redhat/eap7-jboss-ejb-client to a version that resolves this vulnerability.

    Fixed in 0:4.0.39-1.SP1_redhat_00001.1.el7ea
  24. Upgrade

    Upgrade redhat/eap7-jboss-logmanager to a version that resolves this vulnerability.

    Fixed in 0:2.1.18-1.Final_redhat_00001.1.el7ea
  25. Upgrade

    Upgrade redhat/eap7-jboss-remoting to a version that resolves this vulnerability.

    Fixed in 0:5.0.20-2.SP1_redhat_00001.1.el7ea
  26. Upgrade

    Upgrade redhat/eap7-jboss-server-migration to a version that resolves this vulnerability.

    Fixed in 0:1.7.2-5.Final_redhat_00006.1.el7ea
  27. Upgrade

    Upgrade redhat/eap7-narayana to a version that resolves this vulnerability.

    Fixed in 0:5.9.11-1.Final_redhat_00001.1.el7ea
  28. Upgrade

    Upgrade redhat/eap7-undertow to a version that resolves this vulnerability.

    Fixed in 0:2.0.34-1.SP1_redhat_00001.1.el7ea
  29. Upgrade

    Upgrade redhat/eap7-wildfly to a version that resolves this vulnerability.

    Fixed in 0:7.3.6-1.GA_redhat_00002.1.el7ea
  30. Upgrade

    Upgrade redhat/eap7-wildfly-elytron to a version that resolves this vulnerability.

    Fixed in 0:1.10.11-1.Final_redhat_00001.1.el7ea
  31. Upgrade

    Upgrade redhat/eap7-wildfly-http-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.25-1.Final_redhat_00001.1.el7ea
  32. Upgrade

    Upgrade redhat/eap7-wildfly-naming-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.14-1.Final_redhat_00001.1.el7ea
  33. Upgrade

    Upgrade redhat/eap7-activemq-artemis to a version that resolves this vulnerability.

    Fixed in 0:2.9.0-9.redhat_00019.1.el8ea
  34. Upgrade

    Upgrade redhat/eap7-bouncycastle to a version that resolves this vulnerability.

    Fixed in 0:1.68.0-1.redhat_00001.1.el8ea
  35. Upgrade

    Upgrade redhat/eap7-guava-failureaccess to a version that resolves this vulnerability.

    Fixed in 0:1.0.1-1.redhat_00002.1.el8ea
  36. Upgrade

    Upgrade redhat/eap7-guava-libraries to a version that resolves this vulnerability.

    Fixed in 0:30.1.0-1.redhat_00001.1.el8ea
  37. Upgrade

    Upgrade redhat/eap7-hal-console to a version that resolves this vulnerability.

    Fixed in 0:3.2.13-1.Final_redhat_00001.1.el8ea
  38. Upgrade

    Upgrade redhat/eap7-ironjacamar to a version that resolves this vulnerability.

    Fixed in 0:1.4.27-1.Final_redhat_00001.1.el8ea
  39. Upgrade

    Upgrade redhat/eap7-jboss-ejb-client to a version that resolves this vulnerability.

    Fixed in 0:4.0.39-1.SP1_redhat_00001.1.el8ea
  40. Upgrade

    Upgrade redhat/eap7-jboss-logmanager to a version that resolves this vulnerability.

    Fixed in 0:2.1.18-1.Final_redhat_00001.1.el8ea
  41. Upgrade

    Upgrade redhat/eap7-jboss-remoting to a version that resolves this vulnerability.

    Fixed in 0:5.0.20-2.SP1_redhat_00001.1.el8ea
  42. Upgrade

    Upgrade redhat/eap7-jboss-server-migration to a version that resolves this vulnerability.

    Fixed in 0:1.7.2-5.Final_redhat_00006.1.el8ea
  43. Upgrade

    Upgrade redhat/eap7-narayana to a version that resolves this vulnerability.

    Fixed in 0:5.9.11-1.Final_redhat_00001.1.el8ea
  44. Upgrade

    Upgrade redhat/eap7-undertow to a version that resolves this vulnerability.

    Fixed in 0:2.0.34-1.SP1_redhat_00001.1.el8ea
  45. Upgrade

    Upgrade redhat/eap7-wildfly to a version that resolves this vulnerability.

    Fixed in 0:7.3.6-1.GA_redhat_00002.1.el8ea
  46. Upgrade

    Upgrade redhat/eap7-wildfly-elytron to a version that resolves this vulnerability.

    Fixed in 0:1.10.11-1.Final_redhat_00001.1.el8ea
  47. Upgrade

    Upgrade redhat/eap7-wildfly-http-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.25-1.Final_redhat_00001.1.el8ea
  48. Upgrade

    Upgrade redhat/eap7-wildfly-naming-client to a version that resolves this vulnerability.

    Fixed in 0:1.0.14-1.Final_redhat_00001.1.el8ea
  49. Upgrade

    Upgrade redhat/Undertow to a version that resolves this vulnerability.

    Fixed in 2.2.0.
  50. Upgrade

    Upgrade redhat/Undertow to a version that resolves this vulnerability.

    Fixed in 2.1.6.
  51. Upgrade

    Upgrade redhat/Undertow to a version that resolves this vulnerability.

    Fixed in 2.0.34.
  52. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch CVE-2020-10687
  53. Compensating control

    Mitigate HTTP request smuggling risk (CVE-2017-2666) by preventing HTTP/1.x and HTTP/2 requests with invalid characters from reaching Undertow (e.g., enforce strict request/line character validation at the load balancer/reverse proxy/WAF before forwarding).

Event History

Feb 1, 2021
Data Sourced
via Red Hat·01:23 PM
DescriptionSeverityAffected Software
Feb 4, 2021
CVE Published
12:00 AM
Feb 23, 2021
CVE Published
via MITRE·05:21 PM
Data Sourced
via MITRE·05:21 PM
DescriptionWeakness
Oct 18, 58339
Event
05:56 AM

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2021-20220?

CVE-2021-20220 has been classified as a moderate severity vulnerability.

2

How do I fix CVE-2021-20220?

To remediate CVE-2021-20220, you should update the affected packages to the specified versions or later released by Red Hat.

3

Which versions of Undertow are affected by CVE-2021-20220?

Versions of Undertow prior to 2.2.0, 2.1.6, and 2.0.34 are affected by CVE-2021-20220.

4

Can CVE-2021-20220 lead to an XSS attack?

Yes, CVE-2021-20220 could allow an attacker to perform cross-site scripting (XSS) through HTTP request smuggling.

5

What types of software are impacted by CVE-2021-20220?

CVE-2021-20220 affects various Red Hat products including eap7-activemq-artemis, eap7-bouncycastle, and Undertow.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203