CVE-2021-28165: Jetty server Remote Code Execution Vulnerability

Q: What is CVE-2021-28165?

CVE-2021-28165 is a security vulnerability in Jetty server involving Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources under CWE-755: Improper Handling of Exceptional Conditions.

Q: Which Jetty server versions are affected?

Affected versions include releases prior to 9.4.39, 10.0.2, 11.0.2 across affected packages: org.eclipse.jetty:jetty-server.

Q: What version fixes CVE-2021-28165?

Upgrading to 9.4.39, 10.0.2, 11.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is jetty-server affected?

Yes, org.eclipse.jetty:jetty-server is affected in releases prior to 9.4.39, 10.0.2, 11.0.2. Upgrade your dependency to 9.4.39, 10.0.2, 11.0.2 or later.

Q: What is the CVSS score of CVE-2021-28165?

CVE-2021-28165 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.

Q: What CWE is associated with CVE-2021-28165?

CVE-2021-28165 is classified under CWE-755: Improper Handling of Exceptional Conditions (The product does not handle or incorrectly handles an exceptional condition.).

Q: How can I check Maven dependencies for CVE-2021-28165?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.eclipse.jetty'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-26vr-8j45-3r4w

CVSS 7.5

CWE-755 CWE-400 CWE-551

Published 2021-04-06

Advisory Summary

CVE-2021-28165 is a HIGH (CVSS 7.5) remote code execution vulnerability (CWE-755: Improper Handling of Exceptional Conditions) affecting Jetty server libraries in the Maven ecosystem. The issue involves jetty vulnerable to incorrect handling of invalid large tls frame, exhausting cpu resources. Remediation is available by upgrading affected packages to version 9.4.39, 10.0.2, 11.0.2.

CVE-2021-28165 at a Glance

CVE Identifier CVE-2021-28165

GHSA Identifier GHSA-26vr-8j45-3r4w

Severity HIGH

CVSS v3.1 Base Score 7.5

CWE Classification CWE-755: Improper Handling of Exceptional Conditions

Affected Product Jetty server

Package Ecosystem Maven

Published Date 2021-04-06

Last Updated 2022-08-10

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-2021-28165

To remediate this vulnerability, upgrade all affected Jetty server 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.eclipse.jetty:jetty-server fixed: 9.4.39

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-server</artifactId>
    <version>9.4.39</version>
</dependency>

org.eclipse.jetty:jetty-server fixed: 10.0.2

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-server</artifactId>
    <version>10.0.2</version>
</dependency>

org.eclipse.jetty:jetty-server fixed: 11.0.2

<dependency>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-server</artifactId>
    <version>11.0.2</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.eclipse.jetty

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-28165, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.eclipse.jetty

Analyze the terminal output to locate any version of Jetty server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.4.39), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.eclipse.jetty 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-755: Improper Handling of Exceptional Conditions, where the product does not handle or incorrectly handles an exceptional condition. In Jetty server, 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

### Impact When using SSL/TLS with Jetty, either with HTTP/1.1, HTTP/2, or WebSocket, the server may receive an invalid large (greater than 17408) TLS frame that is incorrectly handled, causing CPU resources to eventually reach 100% usage. ### Workarounds The problem can be worked around by compiling the following class: ```java package org.eclipse.jetty.server.ssl.fix6072; import java.nio.ByteBuffer; import javax.net.ssl.SSLEngine; import javax.net.ssl.SSLEngineResult; import javax.net.ssl.SSLException; import javax.net.ssl.SSLHandshakeException; import org.eclipse.jetty.io.EndPoint; import org.eclipse.jetty.io.ssl.SslConnection; import org.eclipse.jetty.server.Connector; import org.eclipse.jetty.server.SslConnectionFactory; import org.eclipse.jetty.util.BufferUtil; import org.eclipse.jetty.util.annotation.Name; import org.eclipse.jetty.util.ssl.SslContextFactory; public class SpaceCheckingSslConnectionFactory extends SslConnectionFactory { public SpaceCheckingSslConnectionFactory(@Name("sslContextFactory") SslContextFactory factory, @Name("next") String nextProtocol) { super(factory, nextProtocol); } @Override protected SslConnection newSslConnection(Connector connector, EndPoint endPoint, SSLEngine engine) { return new SslConnection(connector.getByteBufferPool(), connector.getExecutor(), endPoint, engine, isDirectBuffersForEncryption(), isDirectBuffersForDecryption()) { @Override protected SSLEngineResult unwrap(SSLEngine sslEngine, ByteBuffer input, ByteBuffer output) throws SSLException { SSLEngineResult results = super.unwrap(sslEngine, input, output); if ((results.getStatus() == SSLEngineResult.Status.BUFFER_UNDERFLOW || results.getStatus() == SSLEngineResult.Status.OK && results.bytesConsumed() == 0 && results.bytesProduced() == 0) && BufferUtil.space(input) == 0) { BufferUtil.clear(input); throw new SSLHandshakeException("Encrypted buffer max length exceeded"); } return results; } }; } } ``` This class can be deployed by: + The resulting class file should be put into a jar file (eg sslfix6072.jar) + The jar file should be made available to the server. For a normal distribution this can be done by putting the file into ${jetty.base}/lib + Copy the file `${jetty.home}/modules/ssl.mod` to `${jetty.base}/modules` + Edit the `${jetty.base}/modules/ssl.mod` file to have the following section: ``` [lib] lib/sslfix6072.jar ``` + Copy the file `${jetty.home}/etc/jetty-https.xml` and`${jetty.home}/etc/jetty-http2.xml` to `${jetty.base}/etc` + Edit files `${jetty.base}/etc/jetty-https.xml` and `${jetty.base}/etc/jetty-http2.xml`, changing any reference of `org.eclipse.jetty.server.SslConnectionFactory` to `org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory`. For example: ```xml <Call name="addIfAbsentConnectionFactory"> <Arg> <New class="org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory"> <Arg name="next">http/1.1</Arg> <Arg name="sslContextFactory"><Ref refid="sslContextFactory"/></Arg> </New> </Arg> </Call> ``` + Restart Jetty

CVE-2021-28165 Affected Jetty server Versions

3 component(s)

Fixed Versions:

9.4.3910.0.211.0.2

Product / Package	Ecosystem	Affected Versions	Fixed Version
org.eclipse.jetty:jetty-server maven/org.eclipse.jetty/jetty-server	Maven	≥ 7.2.2 < 9.4.39	9.4.39
org.eclipse.jetty:jetty-server maven/org.eclipse.jetty/jetty-server	Maven	≥ 10.0.0 < 10.0.2	10.0.2
org.eclipse.jetty:jetty-server maven/org.eclipse.jetty/jetty-server	Maven	≥ 11.0.0 < 11.0.2	11.0.2

References

GitHub Advisory / Wiki ADVISORY

https://github.com/eclipse/jetty.project/security/advisories/GHSA-26vr-8j45-3r4w

NVD — CVE-2021-28165 NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-28165

Jetty server Security Information SECURITY

https://www.oracle.com/security-alerts/cpuoct2021.html

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Jetty server Security Information SECURITY

https://www.oracle.com/security-alerts/cpujan2022.html

Jetty server Security Information SECURITY

https://www.oracle.com/security-alerts/cpuapr2022.html

Jetty server Security Information SECURITY

https://www.oracle.com//security-alerts/cpujul2021.html

Jetty server Security Information SECURITY

https://www.debian.org/security/2021/dsa-4949

Jetty server Security Information SECURITY

https://security.netapp.com/advisory/ntap-20210611-0006

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Jetty server Source Repository REPOSITORY

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Jetty server Security Information SECURITY

http://www.openwall.com/lists/oss-security/2021/04/20/3

Frequently Asked Questions

What is CVE-2021-28165?

CVE-2021-28165 is a security vulnerability in Jetty server involving Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources under CWE-755: Improper Handling of Exceptional Conditions.

Which Jetty server versions are affected?

Affected versions include releases prior to 9.4.39, 10.0.2, 11.0.2 across affected packages: org.eclipse.jetty:jetty-server.

What version fixes CVE-2021-28165?

Upgrading to 9.4.39, 10.0.2, 11.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Is jetty-server affected?

Yes, org.eclipse.jetty:jetty-server is affected in releases prior to 9.4.39, 10.0.2, 11.0.2. Upgrade your dependency to 9.4.39, 10.0.2, 11.0.2 or later.

What is the CVSS score of CVE-2021-28165?

CVE-2021-28165 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-2021-28165?

CVE-2021-28165 is classified under CWE-755: Improper Handling of Exceptional Conditions (The product does not handle or incorrectly handles an exceptional condition.).

How can I check Maven dependencies for CVE-2021-28165?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.eclipse.jetty'. 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-26vr-8j45-3r4w",
  "modified" : "2022-08-10T23:33:55Z",
  "published" : "2021-04-06T17:31:30Z",
  "aliases" : [ "CVE-2021-28165" ],
  "summary" : "Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources",
  "details" : "### Impact\nWhen using SSL/TLS with Jetty, either with HTTP/1.1, HTTP/2, or WebSocket, the server may receive an invalid large (greater than 17408) TLS frame that is incorrectly handled, causing CPU resources to eventually reach 100% usage.\n\n### Workarounds\n\nThe problem can be worked around by compiling the following class:\n```java\npackage org.eclipse.jetty.server.ssl.fix6072;\n\nimport java.nio.ByteBuffer;\nimport javax.net.ssl.SSLEngine;\nimport javax.net.ssl.SSLEngineResult;\nimport javax.net.ssl.SSLException;\nimport javax.net.ssl.SSLHandshakeException;\n\nimport org.eclipse.jetty.io.EndPoint;\nimport org.eclipse.jetty.io.ssl.SslConnection;\nimport org.eclipse.jetty.server.Connector;\nimport org.eclipse.jetty.server.SslConnectionFactory;\nimport org.eclipse.jetty.util.BufferUtil;\nimport org.eclipse.jetty.util.annotation.Name;\nimport org.eclipse.jetty.util.ssl.SslContextFactory;\n\npublic class SpaceCheckingSslConnectionFactory extends SslConnectionFactory\n{\n    public SpaceCheckingSslConnectionFactory(@Name(\"sslContextFactory\") SslContextFactory factory, @Name(\"next\") String nextProtocol)\n    {\n        super(factory, nextProtocol);\n    }\n\n    @Override\n    protected SslConnection newSslConnection(Connector connector, EndPoint endPoint, SSLEngine engine)\n    {\n        return new SslConnection(connector.getByteBufferPool(), connector.getExecutor(), endPoint, engine, isDirectBuffersForEncryption(), isDirectBuffersForDecryption())\n        {\n            @Override\n            protected SSLEngineResult unwrap(SSLEngine sslEngine, ByteBuffer input, ByteBuffer output) throws SSLException\n            {\n                SSLEngineResult results = super.unwrap(sslEngine, input, output);\n\n                if ((results.getStatus() == SSLEngineResult.Status.BUFFER_UNDERFLOW ||\n                    results.getStatus() == SSLEngineResult.Status.OK && results.bytesConsumed() == 0 && results.bytesProduced() == 0) &&\n                    BufferUtil.space(input) == 0)\n                {\n                    BufferUtil.clear(input);\n                    throw new SSLHandshakeException(\"Encrypted buffer max length exceeded\");\n                }\n                return results;\n            }\n        };\n    }\n}\n```\nThis class can be deployed by:\n + The resulting class file should be put into a jar file (eg sslfix6072.jar)\n + The jar file should be made available to the server. For a normal distribution this can be done by putting the file into ${jetty.base}/lib\n + Copy the file `${jetty.home}/modules/ssl.mod` to `${jetty.base}/modules`\n + Edit the `${jetty.base}/modules/ssl.mod` file to have the following section:\n\n```\n[lib]\nlib/sslfix6072.jar\n```\n\n+ Copy the file `${jetty.home}/etc/jetty-https.xml` and`${jetty.home}/etc/jetty-http2.xml` to `${jetty.base}/etc`\n+ Edit files `${jetty.base}/etc/jetty-https.xml` and `${jetty.base}/etc/jetty-http2.xml`, changing any reference of `org.eclipse.jetty.server.SslConnectionFactory` to `org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory`. For example:\n```xml\n  <Call name=\"addIfAbsentConnectionFactory\">\n    <Arg>\n      <New class=\"org.eclipse.jetty.server.ssl.fix6072.SpaceCheckingSslConnectionFactory\">\n        <Arg name=\"next\">http/1.1</Arg>\n        <Arg name=\"sslContextFactory\"><Ref refid=\"sslContextFactory\"/></Arg>\n      </New>\n    </Arg>\n  </Call>\n```\n+ Restart Jetty",
  "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" : {
      "ecosystem" : "Maven",
      "name" : "org.eclipse.jetty:jetty-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.2.2"
      }, {
        "fixed" : "9.4.39"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.eclipse.jetty:jetty-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.eclipse.jetty:jetty-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "11.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/eclipse/jetty.project/security/advisories/GHSA-26vr-8j45-3r4w"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-28165"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuoct2021.html"
  }, {
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  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpujan2022.html"
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    "url" : "https://security.netapp.com/advisory/ntap-20210611-0006"
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  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-551", "CWE-755" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-02T23:02:13Z",
    "nvd_published_at" : "2021-04-01T15:15:00Z"
  }
}

CVSS V3

7.5 HIGH

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)

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Advisory Metadata

Source ID: GHSA-26vr-8j45-3r4w
Schema Version: 1.4.0
Published: 2021-04-06 17:31
Last Modified: 2022-08-10 23:33
Database Record File: advisories/github-reviewed/2021/04/GHSA-26vr-8j45-3r4w/GHSA-26vr-8j45-3r4w.json