CVE-2025-53506
Apache Tomcat: DoS via excessive h2 streams at connection start
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Attend
*SSVC
Descriptions
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. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
*Credits:
Kanatoko
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Attend
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2025-07-01 CVE Reserved
- 2025-07-10 CVE Published
- 2025-07-11 CVE Updated
- 2025-07-12 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-400: Uncontrolled Resource Consumption
CAPEC
References (1)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0 | 2025-07-10 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Apache Software Foundation Search vendor "Apache Software Foundation" | Apache Tomcat Search vendor "Apache Software Foundation" for product "Apache Tomcat" | >= 11.0.0-M1 <= 11.0.8 Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 11.0.0-M1 <= 11.0.8" | en |
Affected
| ||||||
| Apache Software Foundation Search vendor "Apache Software Foundation" | Apache Tomcat Search vendor "Apache Software Foundation" for product "Apache Tomcat" | >= 10.1.0-M1 <= 10.1.42 Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 10.1.0-M1 <= 10.1.42" | en |
Affected
| ||||||
| Apache Software Foundation Search vendor "Apache Software Foundation" | Apache Tomcat Search vendor "Apache Software Foundation" for product "Apache Tomcat" | >= 9.0.0.M1 <= 9.0.106 Search vendor "Apache Software Foundation" for product "Apache Tomcat" and version " >= 9.0.0.M1 <= 9.0.106" | en |
Affected
| ||||||