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  5. CVE-2020-13935

CVE-2020-13935: Infinite Loop in Apache Tomcat

February 8, 2022 (updated June 11, 2026)

The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.

References

  • github.com/advisories/GHSA-m7jv-hq7h-mq7c
  • github.com/apache/tomcat/commit/12d715676038efbf9c728af10163f8277fc019d5
  • github.com/apache/tomcat/commit/1c1c77b0efb667cea80b532440b44cea1dc427c3
  • github.com/apache/tomcat/commit/40fa74c74822711ab878079d0a69f7357926723d
  • github.com/apache/tomcat/commit/4c04982870d6e730c38e21e58fb653b7cf723784
  • github.com/apache/tomcat/commit/f9f75c14678b68633f79030ddf4ff827f014cc84
  • kc.mcafee.com/corporate/index?page=content&id=SB10332
  • lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50@%3Cusers.tomcat.apache.org%3E
  • lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E
  • lists.debian.org/debian-lts-announce/2020/07/msg00017.html
  • nvd.nist.gov/vuln/detail/CVE-2020-13935
  • security.netapp.com/advisory/ntap-20200724-0003
  • tomcat.apache.org/security-10.html
  • tomcat.apache.org/security-7.html
  • tomcat.apache.org/security-8.html
  • tomcat.apache.org/security-9.html
  • usn.ubuntu.com/4448-1
  • usn.ubuntu.com/4596-1
  • www.debian.org/security/2020/dsa-4727
  • www.oracle.com//security-alerts/cpujul2021.html
  • www.oracle.com/security-alerts/cpuApr2021.html
  • www.oracle.com/security-alerts/cpuapr2022.html
  • www.oracle.com/security-alerts/cpujan2021.html
  • www.oracle.com/security-alerts/cpujan2022.html
  • www.oracle.com/security-alerts/cpuoct2020.html
  • www.oracle.com/security-alerts/cpuoct2021.html

Code Behaviors & Features

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Affected versions

All versions starting from 7.0.27 before 7.0.105, all versions starting from 8.5.0 before 8.5.57, all versions starting from 9.0.0-M.1 before 9.0.37, all versions starting from 10.0.0-M1 before 10.0.0-M7

Fixed versions

  • 7.0.105
  • 8.5.57
  • 9.0.37
  • 10.0.0-M7

Solution

Upgrade to versions 7.0.105, 8.5.57, 9.0.37, 10.0.0-M7 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/tomcat/CVE-2020-13935.yml

Spotted a mistake? Edit the file on GitLab.

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