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Vulnerabilities associated with io.undertow:undertow-core.

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Showing 25 vulnerabilities on this page for io.undertow:undertow-core

Signals CISA KEV Ransomware Nuclei
VulnerabilityTitle and contextCVSSEPSSPoCsSignals

Undertow: outofmemoryerror in httpservletrequestimpl.getparameternames() can cause remote dos attacks

A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.

CWE-20CWE-770Jan 30, 2026
CVSS7.5v3.1EPSS0.575%PoCs0SignalsSTIX

Undertow-core: undertow http server fails to reject malformed host headers leading to potential cache poisoning and ssrf

A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.

CWE-20Jan 7, 2026
CVSS9.6v3.1EPSS1.2%PoCs1SignalsSTIX

Undertow: outofmemory when parsing form data encoding with application/x-www-form-urlencoded

A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.

CWE-20Dec 3, 2025
CVSS7.5v3.1EPSS1.38%PoCs0SignalsSTIX

Undertow: undertow madeyoureset http/2 ddos vulnerability

A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS).

CWE-404CWE-770Sep 2, 2025
CVSS7.5v3.1EPSS2.33%PoCs1SignalsSTIX

Undertow: cookie smuggling/spoofing

A flaw was found in Undertow, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. This issue could allow an attacker to construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification. The main threat from this flaw impacts data confidentiality and integrity.

CWE-444Nov 17, 2024
CVSS7.4v3.1EPSS1.12%PoCs0SignalsSTIX

Undertow: unrestricted request storage leads to memory exhaustion

A flaw was found in Undertow package. Using the FormAuthenticationMechanism, a malicious user could trigger a Denial of Service by sending crafted requests, leading the server to an OutofMemory error, exhausting the server's memory.

CWE-20CWE-400Nov 7, 2024
CVSS-v4.0EPSS1.29%PoCs0SignalsSTIX

Undertow: improper state management in proxy protocol parsing causes information leakage

A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuilder instance across multiple requests. This issue occurs when the parseProxyProtocolV1 method processes multiple requests on the same HTTP connection. As a result, different requests may share the same StringBuilder instance, potentially leading to information leakage between requests or responses. In some cases, a value from a previous request or response may be erroneously reused, which could le…

CWE-362Aug 21, 2024
CVSS-v4.0EPSS2.64%PoCs0SignalsSTIX

Undertow: learningpushhandler can lead to remote memory dos attacks

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

CWE-401Jul 8, 2024
CVSS-v4.0EPSS1.87%PoCs0SignalsSTIX

Undertow: response write hangs in case of java 17 tlsv1.3 newsessionticket

A vulnerability was found in Undertow, where the chunked response hangs after the body was flushed. The response headers and body were sent but the client would continue waiting as Undertow does not send the expected 0\r\n termination of the chunked response. This results in uncontrolled resource consumption, leaving the server side to a denial of service attack. This happens only with Java 17 TLSv1.3 scenarios.

CWE-674Jul 8, 2024
CVSS-v4.0EPSS2.72%PoCs0SignalsSTIX

Undertow: url-encoded request path information can be broken on ajp-listener

A vulnerability was found in Undertow, where URL-encoded request paths can be mishandled during concurrent requests on the AJP listener. This issue arises because the same buffer is used to decode the paths for multiple requests simultaneously, leading to incorrect path information being processed. As a result, the server may attempt to access the wrong path, causing errors such as "404 Not Found" or other application failures. This flaw can potentially lead to a denial of service, as legitimate…

CWE-400CWE-488Jun 20, 2024
CVSS-v4.0EPSS1.7%PoCs0SignalsSTIX

Undertow: out-of-memory error after several closed connections with wildfly-http-client protocol

A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available. At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed…

CWE-400Feb 19, 2024
CVSS-v4.0EPSS4.57%PoCs0SignalsSTIX

Undertow: directory traversal vulnerability

A path traversal vulnerability was found in Undertow. This issue may allow a remote attacker to append a specially-crafted sequence to an HTTP request for an application deployed to JBoss EAP, which may permit access to privileged or restricted files and directories.

CWE-24Feb 12, 2024
CVSS5.3v3.1EPSS1.71%PoCs0SignalsSTIX

Undertow: infinite loop in sslconduit during close

A flaw was found in undertow. This issue makes achieving a denial of service possible due to an unexpected handshake status updated in SslConduit, where the loop never terminates.

CWE-835Sep 14, 2023
CVSS7.5v3.1EPSS1.77%PoCs0SignalsSTIX

Undertow client not checking server identity presented by server certificate in https connections

The undertow client is not checking the server identity presented by the server certificate in https connections. This is a compulsory step (at least it should be performed by default) in https and in http/2. I would add it to any TLS client protocol.

CWE-918Feb 23, 2023
CVSS7.5v3.1EPSS0.596%PoCs0SignalsSTIX

Undertow vulnerable to Denial of Service (DoS) attacks

A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.

CWE-214CWE-400CWE-668Aug 26, 2022
CVSS7.5v3.1EPSS1.3%PoCs0SignalsSTIX

Undertow vulnerable to memory exhaustion due to buffer leak

A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.

CWE-400CWE-401Aug 23, 2022
CVSS7.5v3.1EPSS1.39%PoCs0SignalsSTIX

Undertow vulnerable to Dos via Large AJP request

When a POST request comes through AJP and the request exceeds the max-post-size limit (maxEntitySize), Undertow's AjpServerRequestConduit implementation closes a connection without sending any response to the client/proxy. This behavior results in that a front-end proxy marking the backend worker (application server) as an error state and not forward requests to the worker for a while. In mod_cluster, this continues until the next STATUS request (10 seconds intervals) from the application server…

CWE-400Aug 5, 2022
CVSS7.5v3.1EPSS0.988%PoCs0SignalsSTIX

undertow Race Condition vulnerability

A flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final.

CWE-362May 24, 2022
CVSS5.9v3.1EPSS1.12%PoCs0SignalsSTIX

Undertow Uncontrolled Resource Consumption

A flaw was found in Undertow. A potential security issue in flow control handling by the browser over http/2 may potentially cause overhead or a denial of service in the server. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.40.Final and prior to 2.2.11.Final.

CWE-400May 24, 2022
CVSS5.9v3.1EPSS1.3%PoCs0SignalsSTIX

Denial of service in Undertow

A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.

CWE-400Feb 23, 2021
CVSS7.5v3.1EPSS1.38%PoCs0SignalsSTIX

HTTP request smuggling in Undertow

A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.

CWE-444Feb 23, 2021
CVSS4.8v3.1EPSS1.12%PoCs0SignalsSTIX

HTTP Request Smuggling in Undertow

A flaw was discovered in all versions of Undertow before Undertow 2.2.0.Final, where HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own.

CWE-444Sep 23, 2020
CVSS4.8v3.1EPSS1.15%PoCs0SignalsSTIX

Allocation of Resources Without Limits or Throttling in Undertow

A flaw was discovered in Undertow in versions before Undertow 2.1.1.Final where certain requests to the "Expect: 100-continue" header may cause an out of memory error. This flaw may potentially lead to a denial of service.

CWE-770Jun 10, 2020
CVSS7.5v3.1EPSS1.19%PoCs0SignalsSTIX

HTTP Request Smuggling in Undertow

A flaw was found in Undertow in versions before 2.1.1.Final, regarding the processing of invalid HTTP requests with large chunk sizes. This flaw allows an attacker to take advantage of HTTP request smuggling.

CWE-444May 26, 2020
CVSS6.5v3.1EPSS1.01%PoCs0SignalsSTIX

Improper Authorization in Undertoe

A file inclusion vulnerability was found in the AJP connector enabled with a default AJP configuration port of 8009 in Undertow version 2.0.29.Final and before and was fixed in 2.0.30.Final. A remote, unauthenticated attacker could exploit this vulnerability to read web application files from a vulnerable server. In instances where the vulnerable server allows file uploads, an attacker could upload malicious JavaServer Pages (JSP) code within a variety of file types and trigger this vulnerabilit…

CWE-285Apr 28, 2020
CVSS8.6v3.1EPSS4.84%PoCs0SignalsSTIX