CVE-2020-13934
If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 64.1%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 64.12% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-401, CWE-476
- Affected
- apache/tomcat · debian/debian linux · netapp/oncommand system manager · opensuse/leap · canonical/ubuntu linux · oracle/agile engineering data management · oracle/agile product lifecycle management · oracle/communications instant messaging server · oracle/fmw platform · oracle/instantis enterprisetrack · oracle/managed file transfer · oracle/mysql enterprise monitor · oracle/siebel ui framework · oracle/workload manager
- Source
- security@apache.org
EPSS 64.1% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.htmlMailing List, Third Party Advisory
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3EMailing List, Release Notes, Vendor Advisory
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/07/msg00017.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200724-0003/Third Party Advisory
- https://usn.ubuntu.com/4596-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4727Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.htmlMailing List, Third Party Advisory
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3EMailing List, Release Notes, Vendor Advisory
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/07/msg00017.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200724-0003/Third Party Advisory
- https://usn.ubuntu.com/4596-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4727Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.