CVE-2025-53506

CWE-400 — Uncontrolled Resource Consumption7 documents6 sources
Severity
7.5HIGH
EPSS
0.4%
top 37.52%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Apache Software Foundation Apache TomcatApache Tomcat
Timeline
PublishedJul 10

Description

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. Other EOL versions may also be affected. Users are recommended to…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages7 packages

▶Mavenorg.apache.tomcat:tomcat-coyote11.0.0-M1 — 11.0.9+3
▶Mavenorg.apache.tomcat.embed:tomcat-embed-core9.0.0.M1 — 9.0.107+3
▶NVDapache/tomcat9.0.0 — 9.0.106+2
▶CVEListV5apache_software_foundation/apache_tomcat11.0.0-M1 — 11.0.8+3
▶Debiantomcat9< 9.0.107-0+deb11u1+3

🔴Vulnerability Details

4
OSV
CVE-2025-53506: Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the m↗2025-07-10
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GHSA
Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams↗2025-07-10
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CVEList
Apache Tomcat: DoS via excessive h2 streams at connection start↗2025-07-10
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OSV
Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams↗2025-07-10
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📋Vendor Advisories

2
Red Hat
tomcat: Apache Tomcat denial of service↗2025-07-10
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Debian
CVE-2025-53506: tomcat10 - Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 cl...↗2025
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