High 7.5Published Jul 14, 2020

CVE-2020-13935The 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.

Updated under an hour ago (Oct 27, 2026, 7:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Modified
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

apache tomcat apache:tomcat	from 7.0.27 through 7.0.104; from 8.5.0 through 8.5.56; from 9.0.1 through 9.0.36; 9.0.0; 9.0.0; 9.0.0; 9.0.0; 9.0.0; and 28 more ranges	NVD
debian debian_linux debian:debian_linux	9.0; 10.0	NVD
netapp oncommand_system_manager netapp:oncommand_system_manager	from 3.0.0 through 3.1.3	NVD
opensuse leap opensuse:leap	15.1; 15.2	NVD
canonical ubuntu_linux canonical:ubuntu_linux	16.04; 20.04	NVD
mcafee epolicy_orchestrator mcafee:epolicy_orchestrator	5.9.0; 5.9.1; 5.10.0; 5.10.0; 5.10.0; 5.10.0; 5.10.0; 5.10.0; and 3 more ranges	NVD
oracle agile_engineering_data_management oracle:agile_engineering_data_management	6.2.1.0	NVD
oracle agile_product_lifecycle_management oracle:agile_product_lifecycle_management	9.3.3; 9.3.5; 9.3.6	NVD
oracle blockchain_platform oracle:blockchain_platform	before 21.1.2	NVD
oracle commerce_guided_search oracle:commerce_guided_search	11.3.2	NVD
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References

References

https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E	x-refsource-misc
https://www.debian.org/security/2020/dsa-4727	vendor-advisory, x-refsource-debian
https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html	mailing-list, x-refsource-mlist
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html	vendor-advisory, x-refsource-suse
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html	vendor-advisory, x-refsource-suse
https://usn.ubuntu.com/4448-1/	vendor-advisory, x-refsource-ubuntu
https://www.oracle.com/security-alerts/cpuoct2020.html	x-refsource-misc
https://security.netapp.com/advisory/ntap-20200724-0003/	x-refsource-confirm
https://kc.mcafee.com/corporate/index?page=content&id=SB10332	x-refsource-confirm
https://usn.ubuntu.com/4596-1/	vendor-advisory, x-refsource-ubuntu
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.