high 7.5

CVE-2025-52434 json

Apache Tomcat: APR/Native Connector crash leading to DoS

published 2025-07-10 15 mo ago modified 2026-09-08 2 mo ago also BIT-tomcat-2025-52434 , EUVD-2025-21045 , GHSA-4j3c-42xv-3f84

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector. This was particularly noticeable with client initiated closes of HTTP/2 connections.

This issue affects Apache Tomcat: from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other, older, EOL versions may also be affected.

Users are recommended to upgrade to version 9.0.107, which fixes the issue.

Patch / fix

fixed in 6 distros 6 links 1

maven org.apache.tomcat:tomcat-coyote 9.0.107
maven org.apache.tomcat.embed:tomcat-embed-core 9.0.107
bitnami tomcat 9.0.107
apache tomcat-util 9.0.107
apache tomcat 9.0.107
org.apache.tomcat tomcat-util 9.0.107

debian red hat suse opensuse almalinux rocky linux

tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2

debian advisories DEBIAN-CVE-2025-52434

tomcat RHEL 9 1:9.0.87-3.el9_6.3
tomcat-lib RHEL 9 1:9.0.87-3.el9_6.3
tomcat-webapps RHEL 9 1:9.0.87-3.el9_6.3
tomcat-el-3.0-api RHEL 9 1:9.0.87-3.el9_6.3
tomcat-docs-webapp RHEL 9 1:9.0.87-3.el9_6.3
tomcat-jsp-2.3-api RHEL 9 1:9.0.87-3.el9_6.3
tomcat-admin-webapps RHEL 9 1:9.0.87-3.el9_6.3
tomcat-servlet-4.0-api RHEL 9 1:9.0.87-3.el9_6.3

red hat advisories RHSA-2025:14182 RHSA-2025:14183 RHSA-2025:14180 RHSA-2025:14181 RHSA-2025:14177 RHSA-2025:14178

tomcat SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +13 more 9.0.108-150200.91.1
tomcat SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.0.115-3.160.1

suse advisories SUSE-SU-2026:1058-1 SUSE-SU-2025:03024-1

tomcat openSUSE Tumbleweed 9.0.107-1.1

opensuse advisories openSUSE-SU-2025:15440-1

tomcat AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-lib AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-webapps AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-el-3.0-api AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-docs-webapp AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-jsp-2.3-api AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-admin-webapps AlmaLinux 8 1:9.0.87-1.el8_10.6
tomcat-servlet-4.0-api AlmaLinux 8 1:9.0.87-1.el8_10.6

almalinux advisories ALSA-2025:14177 ALSA-2025:14178 ALSA-2025:14181

tomcat Rocky Linux 9 1:9.0.87-3.el9_6.3
tomcat9 Rocky Linux 10 1:9.0.87-5.el10_0.3
tomcat Rocky Linux 8 1:9.0.87-1.el8_10.6

rocky linux advisories RLSA-2025:14181 RLSA-2025:14178 RLSA-2025:14177

github.com/apache/tomcat@8a83c3c commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-52434 updated 2026-11-07 cvss 5.3

tomcat: Apache Tomcat denial of service

Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 9 pki-servlet-engine, pki-servlet-4.0-api
affected: no fix available “Fix deferred”
Red Hat Enterprise Linux AppStream (v. 8) tomcat 9.0.87-1.el8_10.6, tomcat-lib 9.0.87-1.el8_10.6, tomcat-webapps 9.0.87-1.el8_10.6, tomcat-el-3.0-api 9.0.87-1.el8_10.6, tomcat-docs-webapp 9.0.87-1.el8_10.6, tomcat-jsp-2.3-api 9.0.87-1.el8_10.6, +2 more
fixed: vendor fix RHSA-2025:14177
Red Hat Enterprise Linux AppStream (v. 9) tomcat 9.0.87-3.el9_6.3, tomcat-lib 9.0.87-3.el9_6.3, tomcat-webapps 9.0.87-3.el9_6.3, tomcat-el-3.0-api 9.0.87-3.el9_6.3, tomcat-docs-webapp 9.0.87-3.el9_6.3, tomcat-jsp-2.3-api 9.0.87-3.el9_6.3, +2 more
fixed: vendor fix RHSA-2025:14181
Red Hat Enterprise Linux AppStream (v. 10) tomcat9 9.0.87-5.el10_0.3, tomcat9-lib 9.0.87-5.el10_0.3, tomcat9-webapps 9.0.87-5.el10_0.3, tomcat9-el-3.0-api 9.0.87-5.el10_0.3, tomcat9-docs-webapp 9.0.87-5.el10_0.3, tomcat9-jsp-2.3-api 9.0.87-5.el10_0.3, +2 more
fixed: vendor fix RHSA-2025:14178
Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat 9.0.87-1.el8_8.7, tomcat-lib 9.0.87-1.el8_8.7, tomcat-webapps 9.0.87-1.el8_8.7, tomcat-el-3.0-api 9.0.87-1.el8_8.7, tomcat-docs-webapp 9.0.87-1.el8_8.7, tomcat-jsp-2.3-api 9.0.87-1.el8_8.7, +2 more
fixed: vendor fix RHSA-2025:14182
Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat 9.0.87-1.el9_2.6, tomcat-lib 9.0.87-1.el9_2.6, tomcat-webapps 9.0.87-1.el9_2.6, tomcat-el-3.0-api 9.0.87-1.el9_2.6, tomcat-docs-webapp 9.0.87-1.el9_2.6, tomcat-jsp-2.3-api 9.0.87-1.el9_2.6, +2 more
fixed: vendor fix RHSA-2025:14183
Red Hat Enterprise Linux AppStream EUS (v.9.4) tomcat 9.0.87-1.el9_4.6, tomcat-lib 9.0.87-1.el9_4.6, tomcat-webapps 9.0.87-1.el9_4.6, tomcat-el-3.0-api 9.0.87-1.el9_4.6, tomcat-docs-webapp 9.0.87-1.el9_4.6, tomcat-jsp-2.3-api 9.0.87-1.el9_4.6, +2 more
fixed: vendor fix RHSA-2025:14180
Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat 9.0.87-1.el8_8.7, tomcat-lib 9.0.87-1.el8_8.7, tomcat-webapps 9.0.87-1.el8_8.7, tomcat-el-3.0-api 9.0.87-1.el8_8.7, tomcat-docs-webapp 9.0.87-1.el8_8.7, tomcat-jsp-2.3-api 9.0.87-1.el8_8.7, +2 more
fixed: vendor fix RHSA-2025:14182

show 3 more

Red Hat JBoss Web Server 5.8 for RHEL 7 Server jws5-tomcat 9.0.87-12.redhat_00011.1.el7jws, jws5-tomcat-lib 9.0.87-12.redhat_00011.1.el7jws, jws5-tomcat-javadoc 9.0.87-12.redhat_00011.1.el7jws, jws5-tomcat-selinux 9.0.87-12.redhat_00011.1.el7jws, jws5-tomcat-webapps 9.0.87-12.redhat_00011.1.el7jws, jws5-tomcat-java-jdk8 9.0.87-12.redhat_00011.1.el7jws, +6 more Red Hat JBoss Web Server 5.8 for RHEL 8 jws5-tomcat 9.0.87-12.redhat_00011.1.el8jws, jws5-tomcat-lib 9.0.87-12.redhat_00011.1.el8jws, jws5-tomcat-javadoc 9.0.87-12.redhat_00011.1.el8jws, jws5-tomcat-selinux 9.0.87-12.redhat_00011.1.el8jws, jws5-tomcat-webapps 9.0.87-12.redhat_00011.1.el8jws, jws5-tomcat-el-3.0-api 9.0.87-12.redhat_00011.1.el8jws, +4 more Red Hat JBoss Web Server 5.8 for RHEL 9 jws5-tomcat 9.0.87-12.redhat_00011.1.el9jws, jws5-tomcat-lib 9.0.87-12.redhat_00011.1.el9jws, jws5-tomcat-javadoc 9.0.87-12.redhat_00011.1.el9jws, jws5-tomcat-selinux 9.0.87-12.redhat_00011.1.el9jws, jws5-tomcat-webapps 9.0.87-12.redhat_00011.1.el9jws, jws5-tomcat-el-3.0-api 9.0.87-12.redhat_00011.1.el9jws, +4 more
fixed: vendor fix RHSA-2025:11695
Red Hat JBoss Web Server 5.8.5
fixed: vendor fix RHSA-2025:11696
Red Hat Enterprise Linux 10 tomcat
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 15 mo ago (2025-07-11)

Exploit prediction

2.07% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
maven	org.apache.tomcat:tomcat-coyote	>=9.0.0.M1, <9.0.107 >=8.5.0, <=8.5.100	9.0.107
maven	org.apache.tomcat.embed:tomcat-embed-core	>=9.0.0.M1, <9.0.107 >=8.5.0, <=8.5.100	9.0.107
bitnami	tomcat	>=9.0.0, <9.0.107	9.0.107

Affected products

Apache Software Foundation Apache Tomcat

Classification

Weakness

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

github.com /apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018
web
lists.apache.org /thread/gxgh65004f25y8519coth6w7vchww030
vendor-advisory, web, issue-tracking, mailing-list, advisory
lists.debian.org /debian-lts-announce/2025/07/msg00009.html
web
openwall.com /lists/oss-security/2025/07/10/11
web
nvd.nist.gov /vuln/detail/CVE-2025-52434
advisory, web
github.com /apache/tomcat
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary