HOME VULNERABILITIESCVE-2020-13934

HIGH

CVE-2020-13934

CWE-401Published: July 14, 2020· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2020-13934 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Apache1 product(s)

tomcat

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

netapp1 product(s)

oncommand system manager

openSUSE1 product(s)

leap

Oracle9 product(s)

agile engineering data managementagile plmcommunications instant messaging serverfmw platforminstantis enterprisetrackmanaged file transfermysql enterprise monitorsiebel ui frameworkworkload manager

Source: NVD CPE · 26 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html

PATCHhttps://www.oracle.com/security-alerts/cpuApr2021.html

PATCHhttps://www.oracle.com/security-alerts/cpujan2021.html

PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html

PATCHhttps://www.oracle.com/security-alerts/cpuoct2020.html

PATCHhttps://www.oracle.com//security-alerts/cpujul2021.html

PATCHhttps://www.oracle.com/security-alerts/cpuApr2021.html

PATCHhttps://www.oracle.com/security-alerts/cpujan2021.html

PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html

PATCHhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html

ADVISORYhttps://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/07/msg00017.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20200724-0003/

ADVISORYhttps://usn.ubuntu.com/4596-1/

ADVISORYhttps://www.debian.org/security/2020/dsa-4727

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html

ADVISORYhttps://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E

ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/07/msg00017.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20200724-0003/

ADVISORYhttps://usn.ubuntu.com/4596-1/

ADVISORYhttps://www.debian.org/security/2020/dsa-4727

All References (26)

→

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

Quick Facts

CVE IDCVE-2020-13934

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-401

CISA KEVNo

Affected6 vendor(s)

PublishedJul 14, 2020

Related CVEs (CWE-401)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-13934 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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