CVE-2020-13934
Description
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.
Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
- Score
- 0.64124 (64.1% probability)
- Percentile
- 99.2%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA assessment as of Oct 8, 2026
Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
- Automatable
- yes
- Technical impact
- partial
Affected products
Products listed in the CVE record, as the CNA published them.
Apache Tomcat
- affected: Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36, 8.5.1 to 8.5.56
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
- lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15fe…
- DSA-4727 (debian.org)vendor-advisory
- [debian-lts-announce] 20200722 [SECURITY] [DLA 2286-1] tomcat8 security update (lists.debian.org)mailing-list
- openSUSE-SU-2020:1102 (lists.opensuse.org)vendor-advisory
- openSUSE-SU-2020:1111 (lists.opensuse.org)vendor-advisory
- [tomcat-dev] 20200818 [Bug 64671] HTTP/2 Stream.receivedData method throwing continuous NullPointerException in the logs (lists.apache.org)mailing-list
- oracle.com/security-alerts/cpuoct2020.html
- security.netapp.com/advisory/ntap-20200724-0003
- USN-4596-1 (usn.ubuntu.com)vendor-advisory
- oracle.com/security-alerts/cpujan2021.html
- oracle.com/security-alerts/cpuApr2021.html
- oracle.com//security-alerts/cpujul2021.html
- oracle.com/security-alerts/cpujan2022.html
Timeline
- ID reserved
- Record published
- Record last updated
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About CubePath
CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:52 UTC. Sources and licenses