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CVE-2021-41079: Improper Input Validation

September 16, 2021 (updated October 25, 2022)

Apache Tomcat does not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.

References

  • lists.apache.org/thread.html/rccdef0349fdf4fb73a4e4403095446d7fe6264e0a58e2df5c6799434%40%3Cannounce.tomcat.apache.org%3E
  • nvd.nist.gov/vuln/detail/CVE-2021-41079

Code Behaviors & Features

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Affected versions

All versions starting from 8.5.0 before 8.5.64, all versions starting from 9.0.0 before 9.0.44, all versions starting from 10.0.0 up to 10.0.2

Fixed versions

  • 8.5.64
  • 9.0.44
  • 10.0.4

Solution

Upgrade to versions 8.5.64, 9.0.44, 10.0.4 or above.

Impact 7.5 HIGH

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

Learn more about CVSS

Weakness

  • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Source file

maven/org.apache.tomcat.embed/tomcat-embed-core/CVE-2021-41079.yml

Spotted a mistake? Edit the file on GitLab.

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