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  5. CVE-2020-13934

CVE-2020-13934: Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat

February 8, 2022 (updated May 20, 2026)

An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.

References

  • github.com/advisories/GHSA-vf77-8h7g-gghp
  • lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
  • lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
  • lists.debian.org/debian-lts-announce/2020/07/msg00017.html
  • nvd.nist.gov/vuln/detail/CVE-2020-13934
  • security.netapp.com/advisory/ntap-20200724-0003
  • 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/cpujan2021.html
  • www.oracle.com/security-alerts/cpujan2022.html
  • www.oracle.com/security-alerts/cpuoct2020.html

Code Behaviors & Features

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Affected versions

All versions starting from 8.5.1 before 8.5.56, all versions starting from 9.0.0-M.5 before 9.0.36, all versions starting from 10.0.0-M1 before 10.0.0-M6

Fixed versions

  • 8.5.56
  • 9.0.36
  • 10.0.0-M6

Solution

Upgrade to versions 8.5.56, 9.0.36, 10.0.0-M6 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-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-476: NULL Pointer Dereference

Source file

maven/org.apache.tomcat/tomcat-coyote/CVE-2020-13934.yml

Spotted a mistake? Edit the file on GitLab.

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