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CVE-2020-11996

tomcat: specially crafted sequence of HTTP/2 requests can lead to DoS

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 connections, the server could become unresponsive.

CVSS 3.1 · 7.5 High EPSS 26.7% KEV · Not listed
Vendors
Apache Canonical Debian and 4 more
Products
Tomcat Ubuntu Linux Debian Linux and 8 more
CVE-2016-6797

tomcat: unrestricted access to global resources

The ResourceLinkFactory implementation in Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not limit web application access to global JNDI resources to those resources explicitly linked to the web application. Therefore, it was possible for a web application to access any global JNDI resource whether an explicit ResourceLink had been configured or not.

CVSS 3.1 · 7.5 High EPSS 8.1% KEV · Not listed
Vendors
Apache Canonical Debian and 3 more
Products
Tomcat Ubuntu Linux Debian Linux and 12 more
CVE-2016-6796

tomcat: security manager bypass via JSP Servlet config parameters

A malicious web application running on Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 was able to bypass a configured SecurityManager via manipulation of the configuration parameters for the JSP Servlet.

CVSS 3.1 · 7.5 High EPSS 8.3% KEV · Not listed
Vendors
Apache Canonical Debian and 3 more
Products
Tomcat Ubuntu Linux Debian Linux and 13 more
CVE-2016-5018

tomcat: security manager bypass via IntrospectHelper utility function

In Apache Tomcat 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 a malicious web application was able to bypass a configured SecurityManager via a Tomcat utility method that was accessible to web applications.

CVSS 3.1 · 9.1 Critical EPSS 10.3% KEV · Not listed
Vendors
Apache Canonical Debian and 3 more
Products
Tomcat Ubuntu Linux Debian Linux and 13 more
CVE-2016-0762

tomcat: timing attack in Realm implementation

The Realm implementations in Apache Tomcat versions 9.0.0.M1 to 9.0.0.M9, 8.5.0 to 8.5.4, 8.0.0.RC1 to 8.0.36, 7.0.0 to 7.0.70 and 6.0.0 to 6.0.45 did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder.

CVSS 3.1 · 5.9 Medium EPSS 8.0% KEV · Not listed
Vendors
Apache Canonical Debian and 3 more
Products
Tomcat Ubuntu Linux Debian Linux and 13 more
CVE-2021-30640

Auth weakness in JNDIRealm

A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.

CVSS 3.1 · 6.5 Medium EPSS 9.9% KEV · Not listed
Vendors
Apache Debian Oracle and 1 more
Products
Tomcat Debian Linux Communications Cloud Native Core Policy and 7 more
CVE-2021-25329

Incomplete fix for CVE-2020-9484

The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.

CVSS 3.1 · 7.0 High EPSS 9.5% KEV · Not listed
Vendors
Apache Debian Oracle and 1 more
Products
Tomcat Debian Linux Agile Product Lifecycle Management and 12 more
CVE-2021-24122

Apache Tomcat information disclosure

When serving resources from a network location using the NTFS file system, Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0.M1 to 9.0.39, 8.5.0 to 8.5.59 and 7.0.0 to 7.0.106 were susceptible to JSP source code disclosure in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.

CVSS 3.1 · 5.9 Medium EPSS 22.9% KEV · Not listed
Vendors
Apache Debian Oracle and 1 more
Products
Tomcat Debian Linux Agile Product Lifecycle Management and 3 more
CVE-2020-9484

tomcat: deserialization flaw in session persistence storage leading to RCE

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.

CVSS 3.1 · 7.0 High EPSS 55.5% KEV · Not listed
Vendors
Apache Canonical Debian and 5 more
Products
Tomcat Ubuntu Linux Debian Linux and 27 more
CVE-2020-1935

tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling

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 Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

CVSS 3.1 · 4.8 Medium EPSS 9.4% KEV · Not listed
Vendors
Apache Canonical Debian and 4 more
Products
Tomcat Ubuntu Linux Debian Linux and 22 more
CVE-2020-13935

tomcat: multiple requests with invalid payload length in a WebSocket frame could lead to DoS

The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.

CVSS 3.1 · 7.5 High EPSS 86.6% KEV · Not listed
Vendors
Apache Canonical Debian and 5 more
Products
Tomcat Ubuntu Linux Debian Linux and 20 more
CVE-2019-17563

tomcat: Session fixation when using FORM authentication

When using FORM authentication with Apache Tomcat 9.0.0.M1 to 9.0.29, 8.5.0 to 8.5.49 and 7.0.0 to 7.0.98 there was a narrow window where an attacker could perform a session fixation attack. The window was considered too narrow for an exploit to be practical but, erring on the side of caution, this issue has been treated as a security vulnerability.

CVSS 3.1 · 7.5 High EPSS 10.7% KEV · Not listed
Vendors
Apache Canonical Debian and 3 more
Products
Tomcat Ubuntu Linux Debian Linux and 11 more
CVE-2019-12418

tomcat: local privilege escalation

When Apache Tomcat 9.0.0.M1 to 9.0.28, 8.5.0 to 8.5.47, 7.0.0 and 7.0.97 is configured with the JMX Remote Lifecycle Listener, a local attacker without access to the Tomcat process or configuration files is able to manipulate the RMI registry to perform a man-in-the-middle attack to capture user names and passwords used to access the JMX interface. The attacker can then use these credentials to access the JMX interface and gain complete control over the Tomcat instance.

CVSS 3.1 · 7.0 High EPSS 1.2% KEV · Not listed
Vendors
Apache Canonical Debian and 4 more
Products
Tomcat Ubuntu Linux Debian Linux and 4 more
CVE-2016-3092

tomcat: Usage of vulnerable FileUpload package can result in denial of service

The MultipartStream class in Apache Commons Fileupload before 1.3.2, as used in Apache Tomcat 7.x before 7.0.70, 8.x before 8.0.36, 8.5.x before 8.5.3, and 9.x before 9.0.0.M7 and other products, allows remote attackers to cause a denial of service (CPU consumption) via a long boundary string.

CVSS 3.1 · 7.5 High EPSS 37.2% KEV · Not listed
Vendors
Apache Canonical Debian and 2 more
Products
Commons Fileupload Tomcat Ubuntu Linux and 6 more
CVE-2014-0050

apache-commons-fileupload: denial of service due to too-small buffer size used by MultipartStream

MultipartStream.java in Apache Commons FileUpload before 1.3.1, as used in Apache Tomcat, JBoss Web, and other products, allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a crafted Content-Type header that bypasses a loop's intended exit conditions.

CVSS 3.1 · 7.5 High EPSS 83.3% KEV · Not listed
Vendors
Apache Oracle Redhat
Products
Commons Fileupload Tomcat Retail Applications and 13 more
CVE-2026-86243

Apache Tomcat Native: DoS via TLS handshake

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Tomcat Tomcat Native
CVE-2026-86246

Apache Tomcat Native: Insecure OpenSSL options enabled

Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fix the issue.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Tomcat Tomcat Native
CVE-2026-86247

Apache Tomcat Native: Client certificate requirements can be down-graded

Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Apache
Products
Apache Tomcat Tomcat Native
CVE-2026-73581

Apache Tomcat: OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate uses a keystore

Improper Check for Certificate Revocation vulnerability in Apache Tomcat. Both the OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate uses a keystore. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0-M1 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.59, 9.0.122, which fixes the issue.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Apache Redhat
Products
Tomcat Hummingbird
CVE-2026-87022

Apache Tomcat: WebSocket message smuggling with per-message-deflate

Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.56 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.1.22, which fix the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Apache Redhat
Products
Tomcat Hummingbird