Description
The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | Apache Tomcat 10 – < 10.0.0, Apache Tomcat 9 – < 9.0.41, Apache Tomcat 8.5 – < 8.5.61, Apache Tomcat 7 – < 7.0.107 | 10.0.0 |
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 | 9.0.43-1 | — |
| Debian 13 | tomcat9 | 9.0.43-1 | — |
| Debian 12 | tomcat9 | 9.0.43-1 | — |
| Debian 10 | tomcat9 | 9.0.31-1~deb10u4 | DSA-4891-1 |
| Debian 9 | tomcat8 | 8.5.54-0+deb9u6 | DLA-2594-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | tomcat9 | 9.0.31-1ubuntu0.2 | 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 18.04 LTS | tomcat7 | 7.0.78-1ubuntu0.1~esm1 | USN-6908-1 |
| Ubuntu Pro 18.04 LTS | tomcat8 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tomcat7 | 7.0.68-1ubuntu0.4+esm2 | USN-6908-1 |
| Ubuntu Pro 16.04 LTS | tomcat8 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tomcat6 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tomcat7 | 7.0.52-1ubuntu0.16+esm1 | USN-6908-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 5 | jws5-ecj | 4.12.0-3.redhat_2.2.el7jws | RHSA-2021:2561 |
| Red Hat JBoss Web Server 5 | jws5-mod_cluster +1 | 1.4.3-2.Final_redhat_00002.1.el7jws | RHSA-2021:2561 |
| Red Hat JBoss Web Server 5 | jws5-tomcat +11 | 9.0.43-11.redhat_00011.1.el7jws | RHSA-2021:2561 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-native | 1.2.26-3.redhat_3.el7jws | RHSA-2021:2561 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-vault +1 | 1.1.8-2.Final_redhat_00003.1.el7jws | RHSA-2021:2561 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | tomcat | 9.0.36-3.24.1 | SUSE-SU-2021:1008-1 |
| SLES 15 SP1 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SLES 15 | tomcat | 9.0.36-3.79.1 | SUSE-SU-2021:0989-1 |
| SLES 12 SP5 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2026:1058-1, SUSE-SU-2021:0988-1 |
| SLES 12 SP4 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2021:0988-1 |
Show 20 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SLES 12 SP2 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SLES 11 SP4 | tomcat6 | 6.0.53-0.57.19.1 | SUSE-SU-2021:14705-1 |
| SLES for SAP 15 SP1 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SLES for SAP 15 | tomcat | 9.0.36-3.79.1 | SUSE-SU-2021:0989-1 |
| SLES for SAP 12 SP5 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2021:0988-1 |
| SLES for SAP 12 SP4 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2021:0988-1 |
| SLES for SAP 12 SP3 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SLE HPC 15 SP1 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SLE HPC 15 | tomcat | 9.0.36-3.79.1 | SUSE-SU-2021:0989-1 |
| SUSE OpenStack Cloud Crowbar 9 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2021:0988-1 |
| SUSE OpenStack Cloud Crowbar 8 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SUSE OpenStack Cloud 9 | tomcat | 9.0.36-3.64.1 | SUSE-SU-2021:0988-1 |
| SUSE OpenStack Cloud 8 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SUSE Manager Server 4.0 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SUSE Manager Retail Branch Server 4.0 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SUSE Manager Proxy 4.0 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | tomcat6 | 6.0.53-0.57.19.1 | SUSE-SU-2021:14705-1 |
| SUSE HPE Helion OpenStack 8 | tomcat | 8.0.53-29.46.1 | SUSE-SU-2021:1431-1 |
| SUSE Enterprise Storage 6 | tomcat | 9.0.36-4.58.1 | SUSE-SU-2021:1009-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.36-8.4 | openSUSE-SU-2024:11468-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.14-1.1 | openSUSE-SU-2024:13441-1 |
| openSUSE Leap 15.2 | tomcat | 9.0.36-lp152.2.22.1 | openSUSE-SU-2021:0496-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 10.0.0-M1, < 10.0.2 | 10.0.2 | GHSA-jgwr-3qm3-26f3 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 9.0.0, < 9.0.41 | 9.0.41 | GHSA-jgwr-3qm3-26f3 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 8.0.0, < 8.5.61 | 8.5.61 | GHSA-jgwr-3qm3-26f3 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 7.0.0, < 7.0.108 | 7.0.108 | GHSA-jgwr-3qm3-26f3 |
Advisories 18
- RHSA-2021:2561 Red Hat Security Advisory: Red Hat JBoss Web Server 5.5.0 Security release 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-6908-1 tomcat vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 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-2022-1099 Apache Tomcat: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 26, 2026
- DSA-4891-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2594-1 tomcat8 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:1008-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0496-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11468-1 tomcat-9.0.36-8.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1009-1 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
- SUSE-SU-2021:14705-1 Security update for tomcat6 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1431-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0988-1 Security update for tomcat SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2021:0989-1 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
References
- https://lists.apache.org/thread.html/rfe62fbf9d4c314f166fe8c668e50e5d9dd882a99447f26f0367474bf%40%3Cannounce.tomcat.apache.org%3E
- [tomcat-dev] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) mailing-list
- [announce] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) mailing-list
- [tomcat-users] 20210301 [SECURITY] CVE-2021-25329 Apache Tomcat Incomplete fix for CVE-2020-9484 (RCE via session persistence) mailing-list
- [tomcat-dev] 20210301 svn commit: r1887027 - in /tomcat/site/trunk: docs/security-10.html docs/security-7.html docs/security-8.html docs/security-9.html xdocs/security-10.xml xdocs/security-7.xml xdocs/security-8.xml xdocs/security-9.xml mailing-list
- [oss-security] 20210301 CVE-2021-25329: Apache Tomcat Incomplete fix for CVE-2020-9484 mailing-list
- [debian-lts-announce] 20210316 [SECURITY] [DLA 2596-1] tomcat8 security update mailing-list
- DSA-4891 vendor-advisory
- [tomcat-users] 20210701 What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 mailing-list
- [tomcat-users] 20210701 Re: What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 mailing-list
- [tomcat-users] 20210702 Re: What is "h2c"? What is CVE-2021-25329? Re: Most recent security-related update to 8.5 mailing-list
- [tomcat-users] 20210702 Re: CVE-2021-25329, was Re: Most recent security-related update to 8.5 mailing-list
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://security.netapp.com/advisory/ntap-20210409-0002/
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- GLSA-202208-34 vendor-advisory