Vulnerabilities in pkg:maven/org.apache.tomcat/tomcat-websocket

PACKAGE
Advisory Identifier: GHSA-m7jv-hq7h-mq7c
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Advisory Summary

CVE-2020-13935 is a HIGH (CVSS 7.5) infinite loop vulnerability (CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves infinite loop in apache tomcat. Remediation is available by upgrading affected packages to version 10.0.0-M7, 9.0.37, 8.5.57, 7.0.105.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/org.apache.tomcat/tomcat-websocket

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/org.apache.tomcat/tomcat-websocket. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-m7jv-hq7h-mq7c CVE-2020-13935 HIGH Infinite Loop in Apache Tomcat
GHSA-v682-8vv8-vpwr CVE-2024-23672 MODERATE Denial of Service via incomplete cleanup vulnerability in Apache Tomcat

CVE-2020-13935 at a Glance

CVE Identifier CVE-2020-13935
GHSA Identifier GHSA-m7jv-hq7h-mq7c
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Product Apache Tomcat
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-13935

To remediate this vulnerability, upgrade all affected Apache Tomcat dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.tomcat:tomcat fixed: 10.0.0-M7 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>10.0.0-M7</version>
</dependency>
org.apache.tomcat:tomcat fixed: 9.0.37 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>9.0.37</version>
</dependency>
org.apache.tomcat:tomcat fixed: 8.5.57 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>8.5.57</version>
</dependency>
org.apache.tomcat:tomcat fixed: 7.0.105 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>7.0.105</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-websocket fixed: 7.0.105 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-websocket</artifactId>
    <version>7.0.105</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-websocket fixed: 8.5.57 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-websocket</artifactId>
    <version>8.5.57</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-websocket fixed: 9.0.37 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-websocket</artifactId>
    <version>9.0.37</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-websocket fixed: 10.0.0-M7 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-websocket</artifactId>
    <version>10.0.0-M7</version>
</dependency>
org.apache.tomcat:tomcat-websocket fixed: 10.0.0-M7 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-websocket</artifactId>
    <version>10.0.0-M7</version>
</dependency>
org.apache.tomcat:tomcat-websocket fixed: 9.0.37 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-websocket</artifactId>
    <version>9.0.37</version>
</dependency>
org.apache.tomcat:tomcat-websocket fixed: 8.5.57 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-websocket</artifactId>
    <version>8.5.57</version>
</dependency>
org.apache.tomcat:tomcat-websocket fixed: 7.0.105 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-websocket</artifactId>
    <version>7.0.105</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.tomcat

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-13935, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.tomcat

Analyze the terminal output to locate any version of Apache Tomcat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.0.0-M7), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.tomcat command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop'), where the product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. In Apache Tomcat, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2020-13935 Affected Apache Tomcat Versions

12 component(s)
Fixed Versions:
10.0.0-M79.0.378.5.577.0.105
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 10.0.0-M1
< 10.0.0-M7
10.0.0-M7
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 9.0.0.M1
< 9.0.37
9.0.37
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 8.5.0
< 8.5.57
8.5.57
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 7.0.27
< 7.0.105
7.0.105
org.apache.tomcat.embed:tomcat-embed-websocket
maven/org.apache.tomcat.embed/tomcat-embed-websocket
Maven
≥ 7.0.27
< 7.0.105
7.0.105
org.apache.tomcat.embed:tomcat-embed-websocket
maven/org.apache.tomcat.embed/tomcat-embed-websocket
Maven
≥ 8.5.0
< 8.5.57
8.5.57
org.apache.tomcat.embed:tomcat-embed-websocket
maven/org.apache.tomcat.embed/tomcat-embed-websocket
Maven
≥ 9.0.0.M1
< 9.0.37
9.0.37
org.apache.tomcat.embed:tomcat-embed-websocket
maven/org.apache.tomcat.embed/tomcat-embed-websocket
Maven
≥ 10.0.0-M1
< 10.0.0-M7
10.0.0-M7
org.apache.tomcat:tomcat-websocket
maven/org.apache.tomcat/tomcat-websocket
Maven
≥ 10.0.0-M1
< 10.0.0-M7
10.0.0-M7
org.apache.tomcat:tomcat-websocket
maven/org.apache.tomcat/tomcat-websocket
Maven
≥ 9.0.0.M1
< 9.0.37
9.0.37
org.apache.tomcat:tomcat-websocket
maven/org.apache.tomcat/tomcat-websocket
Maven
≥ 8.5.0
< 8.5.57
8.5.57
org.apache.tomcat:tomcat-websocket
maven/org.apache.tomcat/tomcat-websocket
Maven
≥ 7.0.27
< 7.0.105
7.0.105

References

NVD — CVE-2020-13935 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13935
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/12d715676038efbf9c728af10163f8277fc019d5
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/1c1c77b0efb667cea80b532440b44cea1dc427c3
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/40fa74c74822711ab878079d0a69f7357926723d
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/4c04982870d6e730c38e21e58fb653b7cf723784
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/f9f75c14678b68633f79030ddf4ff827f014cc84
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-9.html
usn.ubuntu.com/4448-1 WEB
https://usn.ubuntu.com/4448-1
usn.ubuntu.com/4596-1 WEB
https://usn.ubuntu.com/4596-1
Apache Tomcat Security Information SECURITY
https://www.debian.org/security/2020/dsa-4727
Apache Tomcat Security Information SECURITY
https://www.oracle.com//security-alerts/cpujul2021.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpuApr2021.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpuapr2022.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpujan2021.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpujan2022.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2020.html
Apache Tomcat Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2021.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-8.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-7.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-10.html
Apache Tomcat Security Information SECURITY
https://security.netapp.com/advisory/ntap-20200724-0003
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html
lists.apache.org/thread.html/rd48c72... WEB
https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E
lists.apache.org/thread.html/r4e5d3c... WEB
https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50@%3Cusers.tomcat.apache.org%3E
Apache Tomcat Source Repository REPOSITORY
https://github.com/apache/tomcat
lists.apache.org/thread.html/r4e5d3c... WEB
https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E
kc.mcafee.com/corporate/index WEB
https://kc.mcafee.com/corporate/index?page=content&id=SB10332
Apache Tomcat Security Information SECURITY
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html
Apache Tomcat Security Information SECURITY
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html

Frequently Asked Questions

What is CVE-2020-13935?
CVE-2020-13935 is a security vulnerability in Apache Tomcat involving Infinite Loop in Apache Tomcat under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop').
Which Apache Tomcat versions are affected?
Affected versions include releases prior to 10.0.0-M7, 9.0.37, 8.5.57, 7.0.105 across affected packages: org.apache.tomcat:tomcat, org.apache.tomcat.embed:tomcat-embed-websocket, org.apache.tomcat:tomcat-websocket.
What version fixes CVE-2020-13935?
Upgrading to 10.0.0-M7, 9.0.37, 8.5.57, 7.0.105 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tomcat affected?
Yes, org.apache.tomcat:tomcat is affected in releases prior to 10.0.0-M7, 9.0.37, 8.5.57, 7.0.105. Upgrade your dependency to 10.0.0-M7, 9.0.37, 8.5.57, 7.0.105 or later.
Is tomcat-embed-websocket affected?
Yes, org.apache.tomcat.embed:tomcat-embed-websocket is affected in releases prior to 7.0.105, 8.5.57, 9.0.37, 10.0.0-M7. Upgrade your dependency to 7.0.105, 8.5.57, 9.0.37, 10.0.0-M7 or later.
What is the CVSS score of CVE-2020-13935?
CVE-2020-13935 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-13935?
CVE-2020-13935 is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') (The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.).
How can I check Maven dependencies for CVE-2020-13935?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.tomcat'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m7jv-hq7h-mq7c",
  "modified" : "2026-08-25T18:31:30Z",
  "published" : "2022-02-08T22:05:17Z",
  "aliases" : [ "CVE-2020-13935" ],
  "summary" : "Infinite Loop in Apache Tomcat",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
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      "name" : "org.apache.tomcat:tomcat"
    },
    "ranges" : [ {
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      } ]
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  }, {
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    "ranges" : [ {
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    } ]
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    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat.embed:tomcat-embed-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0.M1"
      }, {
        "fixed" : "9.0.37"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat.embed:tomcat-embed-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0-M1"
      }, {
        "fixed" : "10.0.0-M7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat:tomcat-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0-M1"
      }, {
        "fixed" : "10.0.0-M7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat:tomcat-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0.M1"
      }, {
        "fixed" : "9.0.37"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat:tomcat-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.5.0"
      }, {
        "fixed" : "8.5.57"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat:tomcat-websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.27"
      }, {
        "fixed" : "7.0.105"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-13935"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/12d715676038efbf9c728af10163f8277fc019d5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/1c1c77b0efb667cea80b532440b44cea1dc427c3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/40fa74c74822711ab878079d0a69f7357926723d"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/4c04982870d6e730c38e21e58fb653b7cf723784"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/f9f75c14678b68633f79030ddf4ff827f014cc84"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-9.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4448-1"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4596-1"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2020/dsa-4727"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com//security-alerts/cpujul2021.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuApr2021.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuapr2022.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpujan2021.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpujan2022.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuoct2020.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuoct2021.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-8.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-7.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-10.html"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20200724-0003"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2020/07/msg00017.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50@%3Cusers.tomcat.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread.html/r4e5d3c09f4dd2923191e972408b40fb8b42dbff0bc7904d44b651e50%40%3Cusers.tomcat.apache.org%3E"
  }, {
    "type" : "WEB",
    "url" : "https://kc.mcafee.com/corporate/index?page=content&id=SB10332"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/tomcat"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-835" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-12T18:44:47Z",
    "nvd_published_at" : "2020-07-14T15:15:00Z"
  }
}