Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

GHSA-25xr-qj8w-c4vf

Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams
Back to all
CVE

GHSA-25xr-qj8w-c4vf

Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams

Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, 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.

Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

Package Versions Affected

Package Version
patch Availability
org.apache.tomcat.embed:tomcat-embed-core 11.0.2
Available
Unavailable

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Related Resources

No items found.

References

https://nvd.nist.gov/vuln/detail/CVE-2025-53506, https://github.com/apache/tomcat/commit/2aa6261276ebe50b99276953591e3a2be7898bdb, https://github.com/apache/tomcat/commit/434772930f362145516dd60681134e7f0cf8115b, https://github.com/apache/tomcat/commit/be8f330f83ceddaf3baeed57522e571572b6b99b, https://github.com/apache/tomcat, https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0, https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html, http://www.openwall.com/lists/oss-security/2025/07/10/13

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00205%
EPSS Percentile
0.42712%
Introduced Version
11.0.0-M1,8.5.0,9.0.0.M27,10.0.0-M1,10.1.0-M6,9.0.0.M1
Fix Available
11.0.9,9.0.107,10.1.43

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading