Apache Tomcat at a glance
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| Month | Vulnerabilities | Critical |
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| Nov 2026 | 0 | 0 |
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| Aug 2026 | 0 | 0 |
| Jul 2026 | 0 | 0 |
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| Dec 2025 | 0 | 0 |
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| Dec 2024 | 0 | 0 |
Most common weaknesses
5 results · Feed
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High 7.5
Uncontrolled Resource Consumption in Apache Tomcat
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 conne…
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Critical 9.8
Improper Privilege Management in Tomcat
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an atta…
KEV Mar 3, 2022 -
Medium 4.8
Potential HTTP request smuggling in Apache Tomcat
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if …
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Medium 4.8
Potential HTTP request smuggling in Apache Tomcat
The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Reque…
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Medium 6.1
Cross-site scripting in Apache Tomcat
The SSI printenv command in Apache Tomcat 9.0.0.M1 to 9.0.0.17, 8.5.0 to 8.5.39 and 7.0.0 to 7.0.93 echoes user provided data without escaping and is, therefore, vulnerable to XSS. SSI is disabled by default. The printenv command is intended for debugging and…