tomcat: OutOfMemoryException caused by HTTP/2 connection leak could lead to DoS
Published Jul 14, 2020
7.5
HIGHCVSS 3.1
EPSS 64.12%
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.
Affected products
- Vendor n/a Product Apache Tomcat Defaultn/a
- Version Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36, 8.5.1 to 8.5.56StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Apache Tomcat | n/a |
|
Configuration 1
- ≥ 8.5.1 · ≤ 8.5.56
- ≥ 9.0.1 · ≤ 9.0.36
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 10.0.0
- 10.0.0
- 10.0.0
- 10.0.0
- 10.0.0
- 10.0.0
Configuration 2
- 9.0
- 10.0
Configuration 3
- ≥ 3.0.0 · ≤ 3.1.3
Configuration 5
- 20.04
Configuration 6
- 6.2.1.0
- 9.3.3
- 9.3.5
- 9.3.6
- 10.0.1.5.0
- 12.2.1.3.0
- 12.2.1.4.0
- 17.1
- 17.2
- 17.3
- 12.2.1.3.0
- 12.2.1.4.0
- ≤ 8.0.21
- ≤ 20.12
- 12.2.0.1
- 18c
- 19c
No data.
Red Hat Fuse 7.9
tomcat
Fixed · RHSA-2021:3140
Red Hat JBoss Web Server (JWS) 5.3
tomcat
Fixed · RHSA-2020:3308
Red Hat JBoss Web Server 5.3 on RHEL 6
jws5-tomcat-0:9.0.30-5.redhat_6.1.el6jws
Fixed · RHSA-2020:3306
Red Hat JBoss Web Server 5.3 on RHEL 7
jws5-tomcat-0:9.0.30-5.redhat_6.1.el7jws
Fixed · RHSA-2020:3306
Red Hat JBoss Web Server 5.3 on RHEL 8
jws5-tomcat-0:9.0.30-5.redhat_6.1.el8jws
Fixed · RHSA-2020:3306
Red Hat Runtimes Spring Boot 2.2.6
tomcat
Fixed · RHSA-2020:3806
Red Hat Decision Manager 7
tomcat
Not affected
Red Hat Enterprise Linux 6
tomcat6
Not affected
Red Hat Enterprise Linux 7
tomcat
Not affected
Red Hat Enterprise Linux 8
pki-deps:10.6/pki-servlet-engine
Fix deferred
Red Hat Enterprise Linux 9
tomcat
Not affected
Red Hat JBoss Data Grid 6
jbossweb
Out of support scope
Red Hat JBoss Data Virtualization 6
jbossweb
Out of support scope
Red Hat JBoss Enterprise Application Platform 6
jbossweb
Out of support scope
Red Hat JBoss Fuse 6
tomcat
Out of support scope
Red Hat JBoss Web Server 3
tomcat
Not affected
Red Hat OpenStack Platform 10 (Newton)
opendaylight
Out of support scope
Red Hat OpenStack Platform 13 (Queens)
opendaylight
Not affected
Red Hat Process Automation 7
tomcat
Not affected
Red Hat Software Collections
rh-java-common-tomcat
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Fuse 7.9 | tomcat | Fixed | RHSA-2021:3140 |
| Red Hat JBoss Web Server (JWS) 5.3 | tomcat | Fixed | RHSA-2020:3308 |
| Red Hat JBoss Web Server 5.3 on RHEL 6 | jws5-tomcat-0:9.0.30-5.redhat_6.1.el6jws | Fixed | RHSA-2020:3306 |
| Red Hat JBoss Web Server 5.3 on RHEL 7 | jws5-tomcat-0:9.0.30-5.redhat_6.1.el7jws | Fixed | RHSA-2020:3306 |
| Red Hat JBoss Web Server 5.3 on RHEL 8 | jws5-tomcat-0:9.0.30-5.redhat_6.1.el8jws | Fixed | RHSA-2020:3306 |
| Red Hat Runtimes Spring Boot 2.2.6 | tomcat | Fixed | RHSA-2020:3806 |
| Red Hat Decision Manager 7 | tomcat | Not affected | n/a |
| Red Hat Enterprise Linux 6 | tomcat6 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | tomcat | Not affected | n/a |
| Red Hat Enterprise Linux 8 | pki-deps:10.6/pki-servlet-engine | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | tomcat | Not affected | n/a |
| Red Hat JBoss Data Grid 6 | jbossweb | Out of support scope | n/a |
| Red Hat JBoss Data Virtualization 6 | jbossweb | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | jbossweb | Out of support scope | n/a |
| Red Hat JBoss Fuse 6 | tomcat | Out of support scope | n/a |
| Red Hat JBoss Web Server 3 | tomcat | Not affected | n/a |
| Red Hat OpenStack Platform 10 (Newton) | opendaylight | Out of support scope | n/a |
| Red Hat OpenStack Platform 13 (Queens) | opendaylight | Not affected | n/a |
| Red Hat Process Automation 7 | tomcat | Not affected | n/a |
| Red Hat Software Collections | rh-java-common-tomcat | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Certificate System 10.0 and Red Hat Enterprise Linux 8's Identity Management, are using a vulnerable version of Tomcat that is bundled into the pki-servlet-engine component. However, HTTP/2 is not enabled in such a configuration, and it is not possible to trigger the flaw in a supported setup. A future update may fix the code.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (59 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 64.12% (0.64124) | 99.20th | v5 (v2026.06.15) |
| Jun 15, 2026 | 64.12% (0.64124) | 99.12th | v5 (v2026.06.15) |
| Mar 4, 2026 | 23.38% (0.23380) | 95.85th | v4 (v2025.03.14) |
| Mar 1, 2026 | 6.08% (0.06082) | 90.63th | v4 (v2025.03.14) |
| Feb 4, 2026 | 23.86% (0.23856) | 95.87th | v4 (v2025.03.14) |
| Feb 1, 2026 | 6.62% (0.06621) | 91.00th | v4 (v2025.03.14) |
| Jan 4, 2026 | 23.38% (0.23380) | 95.77th | v4 (v2025.03.14) |
| Jan 1, 2026 | 6.08% (0.06082) | 90.52th | v4 (v2025.03.14) |
| Dec 4, 2025 | 23.38% (0.23380) | 95.74th | v4 (v2025.03.14) |
| Dec 1, 2025 | 6.08% (0.06082) | 90.44th | v4 (v2025.03.14) |
| Nov 21, 2025 | 23.38% (0.23380) | 95.74th | v4 (v2025.03.14) |
| Nov 18, 2025 | 77.43% (0.77432) | 99.06th | v4 (v2025.03.14) |
| Nov 4, 2025 | 23.38% (0.23380) | 95.72th | v4 (v2025.03.14) |
| Nov 1, 2025 | 6.08% (0.06082) | 90.38th | v4 (v2025.03.14) |
| Oct 4, 2025 | 23.38% (0.23380) | 95.76th | v4 (v2025.03.14) |
| Oct 1, 2025 | 6.08% (0.06082) | 90.42th | v4 (v2025.03.14) |
| Sep 4, 2025 | 24.23% (0.24226) | 95.89th | v4 (v2025.03.14) |
| Sep 1, 2025 | 6.37% (0.06369) | 90.68th | v4 (v2025.03.14) |
| Aug 30, 2025 | 24.23% (0.24226) | 95.87th | v4 (v2025.03.14) |
| Aug 4, 2025 | 17.17% (0.17174) | 94.74th | v4 (v2025.03.14) |
| Aug 1, 2025 | 4.45% (0.04452) | 88.71th | v4 (v2025.03.14) |
| Jul 30, 2025 | 17.17% (0.17174) | 94.73th | v4 (v2025.03.14) |
| Jul 12, 2025 | 20.90% (0.20897) | 95.35th | v4 (v2025.03.14) |
| Jul 4, 2025 | 22.72% (0.22718) | 95.59th | v4 (v2025.03.14) |
| Jul 1, 2025 | 6.28% (0.06284) | 90.52th | v4 (v2025.03.14) |
| Jun 4, 2025 | 22.72% (0.22718) | 95.55th | v4 (v2025.03.14) |
| Jun 1, 2025 | 6.28% (0.06284) | 90.47th | v4 (v2025.03.14) |
| May 4, 2025 | 22.72% (0.22718) | 95.50th | v4 (v2025.03.14) |
| May 1, 2025 | 6.28% (0.06284) | 90.43th | v4 (v2025.03.14) |
| Apr 12, 2025 | 22.72% (0.22718) | 95.40th | v4 (v2025.03.14) |
| Mar 30, 2025 | 55.94% (0.55939) | 97.89th | v4 (v2025.03.14) |
| Mar 29, 2025 | 60.13% (0.60132) | 97.52th | v4 (v2025.03.14) |
| Mar 24, 2025 | 55.94% (0.55939) | 97.90th | v4 (v2025.03.14) |
| Mar 23, 2025 | 64.24% (0.64241) | 98.26th | v4 (v2025.03.14) |
| Mar 17, 2025 | 55.94% (0.55939) | 97.86th | v4 (v2025.03.14) |
| Feb 27, 2025 | 91.22% (0.91225) | 99.17th | v3 (v2023.03.01) |
| Dec 17, 2024 | 92.57% (0.92568) | 99.23th | v3 (v2023.03.01) |
| Jun 20, 2024 | 91.22% (0.91221) | 98.89th | v3 (v2023.03.01) |
| Jun 4, 2024 | 90.61% (0.90615) | 98.82th | v3 (v2023.03.01) |
| May 18, 2024 | 88.97% (0.88969) | 98.71th | v3 (v2023.03.01) |
| Nov 8, 2023 | 89.01% (0.89008) | 98.42th | v3 (v2023.03.01) |
| Oct 16, 2023 | 95.70% (0.95703) | 99.21th | v3 (v2023.03.01) |
| Aug 31, 2023 | 95.83% (0.95832) | 99.20th | v3 (v2023.03.01) |
| Aug 17, 2023 | 95.92% (0.95922) | 99.21th | v3 (v2023.03.01) |
| May 10, 2023 | 95.14% (0.95140) | 98.92th | v3 (v2023.03.01) |
| Mar 30, 2023 | 95.92% (0.95922) | 99.09th | v3 (v2023.03.01) |
| Mar 17, 2023 | 96.18% (0.96180) | 99.16th | v3 (v2023.03.01) |
| Mar 7, 2023 | 96.46% (0.96457) | 99.24th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.77% (0.07767) | 93.09th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.77% (0.07767) | 92.44th | v2 (v2022.01.01) |
| Mar 2, 2022 | 44.26% (0.44262) | 97.74th | v2 (v2022.01.01) |
| Feb 8, 2022 | 34.28% (0.34284) | 96.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 24.93% (0.24927) | 95.37th | v2 (v2022.01.01) |
| Feb 3, 2022 | 31.65% (0.31653) | 96.85th | v1 |
| Jan 6, 2022 | 31.65% (0.31653) | 96.82th | v1 |
| Sep 1, 2021 | 9.36% (0.09356) | 93.96th | v1 |
| Jul 21, 2021 | 9.36% (0.09356) | 0.00th | v1 |
| Jun 15, 2021 | 8.70% (0.08695) | 0.00th | v1 |
| Apr 14, 2021 | 8.02% (0.08024) | 0.00th | v1 |
References (24)
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://mail-archives.apache.org/mod_mbox/tomcat-announce/202007.mbox/%3Cad62f54e-8fd7-e326-25f1-3bdf1ffa3818%40apache.org%3E
- http://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.0-M7
- http://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.105
- http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.57
- http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.37
- https://access.redhat.com/security/cve/CVE-2020-13934 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1857040 Issue Tracking
- https://github.com/advisories/GHSA-vf77-8h7g-gghp Advisory
- https://lists.apache.org/thread.html/r61f411cf82488d6ec213063fc15feeeb88e31b0ca9c29652ee4f962e%40%3Cannounce.tomcat.apache.org%3E x_refsource_MISCMailing ListRelease NotesVendor Advisory
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/ra072b1f786e7d139e86f1d1145572e0ff71cef38a96d9c6f5362aac8@%3Cdev.tomcat.apache.org%3E
- https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-13934
- https://security.netapp.com/advisory/ntap-20200724-0003 x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/4596-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2020-13934
- https://www.debian.org/security/2020/dsa-4727 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISCPatchThird Party Advisory
Change history (0)
No recorded changes yet.