Description
Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | Apache Tomcat 8.5 8.5.0 to 8.5.63, Apache Tomcat 9 9.0.0-M1 to 9.0.43, Apache Tomcat 10 10.0.0-M1 to 10.0.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tomcat9 | 9.0.53-1 | — |
| Debian 13 | tomcat9 | 9.0.53-1 | — |
| Debian 12 | tomcat9 | 9.0.53-1 | — |
| Debian 11 | tomcat9 | 9.0.43-2~deb11u2 | DSA-4986-1 |
| Debian 10 | tomcat9 | 9.0.31-1~deb10u6 | DSA-4986-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | tomcat8 | 8.5.54-0+deb9u8 | DLA-2764-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tomcat9 | 9.0.31-1ubuntu0.2 | USN-6943-1, USN-5360-1 |
| Ubuntu 18.04 LTS | tomcat9 | 9.0.16-3ubuntu0.18.04.2 | USN-5360-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | tomcat9 | 9.0.58-1ubuntu0.1+esm2 | USN-6943-1 |
| Ubuntu Pro 18.04 LTS | tomcat8 | 8.5.39-1ubuntu1~18.04.3+esm2 | USN-6943-1 |
| Ubuntu Pro 18.04 LTS | tomcat9 | 9.0.16-3ubuntu0.18.04.2+esm2 | USN-6943-1 |
| Ubuntu Pro 16.04 LTS | tomcat8 | 8.0.32-1ubuntu1.13+esm1 | USN-6943-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 5 | jws5-tomcat +11 | 9.0.43-13.redhat_00013.1.el7jws | RHSA-2021:3741 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | tomcat | 9.0.36-13.1 | SUSE-SU-2021:3672-1 |
| SLES 15 SP2 | tomcat | 9.0.36-13.1 | SUSE-SU-2021:3672-1 |
| SLES 15 SP1 | tomcat | 9.0.36-4.63.1 | SUSE-SU-2021:3669-1 |
| SLES 15 | tomcat | 9.0.36-3.84.1 | SUSE-SU-2021:3670-1 |
| SLES 12 SP5 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SLES 12 SP5 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2026:1058-1, SUSE-SU-2021:3602-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SLES 12 SP4 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2021:3602-1 |
| SLES for SAP 15 SP1 | tomcat | 9.0.36-4.63.1 | SUSE-SU-2021:3669-1 |
| SLES for SAP 15 | tomcat | 9.0.36-3.84.1 | SUSE-SU-2021:3670-1 |
| SLES for SAP 12 SP5 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SLES for SAP 12 SP5 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2021:3602-1 |
| SLES for SAP 12 SP4 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SLES for SAP 12 SP4 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2021:3602-1 |
| SLE HPC 15 SP1 | tomcat | 9.0.36-4.63.1 | SUSE-SU-2021:3669-1 |
| SLE HPC 15 | tomcat | 9.0.36-3.84.1 | SUSE-SU-2021:3670-1 |
| SUSE OpenStack Cloud Crowbar 9 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SUSE OpenStack Cloud Crowbar 9 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2021:3602-1 |
| SUSE OpenStack Cloud 9 | javapackages-tools | 2.0.1-13.1 | SUSE-SU-2021:3602-1 |
| SUSE OpenStack Cloud 9 | tomcat | 9.0.36-3.71.1 | SUSE-SU-2021:3602-1 |
| SUSE Enterprise Storage 6 | tomcat | 9.0.36-4.63.1 | SUSE-SU-2021:3669-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.43-2.1 | openSUSE-SU-2024:11618-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.14-1.1 | openSUSE-SU-2024:13441-1 |
| openSUSE Leap 15.3 | tomcat | 9.0.36-13.1 | openSUSE-SU-2021:3672-1 |
| openSUSE Leap 15.2 | tomcat | 9.0.36-lp152.2.25.1 | openSUSE-SU-2021:1490-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >= 10.0.0, < 10.0.4 | 10.0.4 | GHSA-59g9-7gfx-c72p |
| Maven | org.apache.tomcat:tomcat | >= 9.0.0, < 9.0.44 | 9.0.44 | GHSA-59g9-7gfx-c72p |
| Maven | org.apache.tomcat:tomcat | >= 8.5.0, < 8.5.64 | 8.5.64 | GHSA-59g9-7gfx-c72p |
Advisories 18
- RHSA-2021:3741 Red Hat Security Advisory: Red Hat JBoss Web Server 5.5.1 Security Update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- WID-SEC-2022-0607 Red Hat FUSE: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 9, 2026
- USN-6943-1 tomcat8, tomcat9 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5360-1 tomcat9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2026:1058-1 Security update for tomcat SUSE / openSUSE Security Updates · Mar 27, 2026
- WID-SEC-2024-0673 Apache Tomcat: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Mar 26, 2026
- DSA-4986-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2764-1 tomcat8 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:3602-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1490-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:3672-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13441-1 tomcat10-10.1.14-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11618-1 tomcat-9.0.43-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3670-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3669-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:3672-1 Security update for tomcat SUSE / openSUSE Security Updates · May 2, 2025
- NCSC-2025-0123 Kwetsbaarheden verholpen in Oracle Database Producten NCSC-NL (Netherlands) · Apr 16, 2025
- WID-SEC-2024-1238 HPE HP-UX: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 27, 2024
References
- https://lists.apache.org/thread.html/rccdef0349fdf4fb73a4e4403095446d7fe6264e0a58e2df5c6799434%40%3Cannounce.tomcat.apache.org%3E
- [debian-lts-announce] 20210922 [SECURITY] [DLA 2764-1] tomcat8 security update mailing-list
- https://security.netapp.com/advisory/ntap-20211008-0005/
- [tomcat-dev] 20211014 [SECURITY] CVE-2021-42340 Apache Tomcat DoS mailing-list
- [tomcat-users] 20211014 [SECURITY] CVE-2021-42340 Apache Tomcat DoS mailing-list
- DSA-4986 vendor-advisory