Home/CVE/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
CVE

CVE-2020-13934

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

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.

HIGH · CVSS 7.5 EPSS 0.2338
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 4% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-401Missing Release of Memory after Effective Lifetime
CWE-476NULL Pointer Dereference
▤

Affected Products & Versions

16
apache tomcat>= 8.5.1 and <= 8.5.56
apache tomcat>= 9.0.1 and <= 9.0.36
apache tomcatall versions
debian linuxall versions
netapp oncommand system manager>= 3.0.0 and <= 3.1.3
opensuse leapall versions
canonical ubuntu linuxall versions
oracle agile engineering data managementall versions
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.apache.tomcat:tomcat HIGH fixed in 10.0.0-M6
Maven org.apache.tomcat:tomcat-coyote HIGH fixed in 10.0.0-M6
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumTomcat WebServer Logs Deleted
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@apache.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Jul 2020 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

22
suse-csafSUSE-SU-2026:1058-1
suse-csafopenSUSE-SU-2024:12103-1
suse-csafopenSUSE-SU-2024:13441-1
rhsaRHSA-2024:1325Important
rhsaRHSA-2024:1324Important
🔗

References & Sources

13
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.htmlMailing ListThird Party Advisory
https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3EMailing ListRelease NotesVendor 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 ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200724-0003/Third Party Advisory
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