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Vulnerability details: VCID-dzan-r49k-kqab
Vulnerability ID VCID-dzan-r49k-kqab
Aliases CVE-2020-13934
GHSA-vf77-8h7g-gghp
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (6)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-401 Missing Release of Memory after Effective Lifetime
CWE-476 NULL Pointer Dereference
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3.1 7.5 http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
generic_textual HIGH http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
cvssv3.1 7.5 http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html
generic_textual HIGH http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13934.json
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
epss 0.2338 https://api.first.org/data/v1/epss?cve=CVE-2020-13934
apache_tomcat Moderate https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13934
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-vf77-8h7g-gghp
cvssv3.1 7.5 https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
generic_textual HIGH https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
cvssv3.1 7.5 https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
generic_textual HIGH https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-13934
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-13934
archlinux High https://security.archlinux.org/AVG-1205
cvssv3.1 7.5 https://security.netapp.com/advisory/ntap-20200724-0003
generic_textual HIGH https://security.netapp.com/advisory/ntap-20200724-0003
cvssv3.1 7.5 https://usn.ubuntu.com/4596-1
generic_textual HIGH https://usn.ubuntu.com/4596-1
cvssv3.1 7.5 https://www.debian.org/security/2020/dsa-4727
generic_textual HIGH https://www.debian.org/security/2020/dsa-4727
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpuApr2021.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpuApr2021.html
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpujan2021.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujan2021.html
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpujan2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujan2022.html
cvssv3.1 7.5 https://www.oracle.com//security-alerts/cpujul2021.html
generic_textual HIGH https://www.oracle.com//security-alerts/cpujul2021.html
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpuoct2020.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpuoct2020.html
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13934.json
https://api.first.org/data/v1/epss?cve=CVE-2020-13934
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/apache/tomcat/commit/172977f04a5215128f1e278a688983dcd230f399
https://github.com/apache/tomcat/commit/923d834500802a61779318911d7898bd85fc950e
https://github.com/apache/tomcat/commit/c9167ae30f3b03b112f3d81772e3450b7d0e6a25
https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
https://security.netapp.com/advisory/ntap-20200724-0003
https://security.netapp.com/advisory/ntap-20200724-0003/
https://usn.ubuntu.com/4596-1
https://usn.ubuntu.com/4596-1/
https://www.debian.org/security/2020/dsa-4727
https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuoct2020.html
1857040 https://bugzilla.redhat.com/show_bug.cgi?id=1857040
AVG-1205 https://security.archlinux.org/AVG-1205
CVE-2020-13934 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13934
CVE-2020-13934 https://nvd.nist.gov/vuln/detail/CVE-2020-13934
GHSA-vf77-8h7g-gghp https://github.com/advisories/GHSA-vf77-8h7g-gghp
RHSA-2020:3306 https://access.redhat.com/errata/RHSA-2020:3306
RHSA-2020:3308 https://access.redhat.com/errata/RHSA-2020:3308
RHSA-2020:3806 https://access.redhat.com/errata/RHSA-2020:3806
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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local

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-13934.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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required

unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-13934
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://security.netapp.com/advisory/ntap-20200724-0003
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://usn.ubuntu.com/4596-1
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.debian.org/security/2020/dsa-4727
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com/security-alerts/cpuApr2021.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com/security-alerts/cpujan2021.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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required

unchanged

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high

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com/security-alerts/cpujan2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com//security-alerts/cpujul2021.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com/security-alerts/cpuoct2020.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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none

required

unchanged

changed

high

low

none

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low

none

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.95925
EPSS Score 0.2338
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:38:06.578797+00:00 Apache Tomcat Importer Import https://tomcat.apache.org/security-10.html 38.0.0