CVE-2021-20250: Jboss ejb client JBoss EJB Client Information Disclosure Vulnerability

MODERATE
Advisory Identifier: GHSA-2259-h742-5vr4
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CVSS 4.3
CWE-200
Published
Advisory Summary

CVE-2021-20250 is a MODERATE (CVSS 4.3) jboss ejb client information disclosure vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Jboss ejb client libraries in the Maven ecosystem. The issue involves jboss ejb client information disclosure vulnerability. Remediation is available by upgrading affected packages to version 4.0.39.

CVE-2021-20250 at a Glance

CVE Identifier CVE-2021-20250
GHSA Identifier GHSA-2259-h742-5vr4
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Jboss ejb client
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

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

How to Fix CVE-2021-20250

To remediate this vulnerability, upgrade all affected Jboss ejb client 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.jboss:jboss-ejb-client fixed: 4.0.39 
<dependency>
    <groupId>org.jboss</groupId>
    <artifactId>jboss-ejb-client</artifactId>
    <version>4.0.39</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.jboss

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-20250, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jboss

Analyze the terminal output to locate any version of Jboss ejb client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.39), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jboss 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Jboss ejb client, 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

A flaw was found in wildfly. The JBoss EJB client has publicly accessible privileged actions which may lead to information disclosure on the server it is deployed on. The highest threat from this vulnerability is to data confidentiality.

CVE-2021-20250 Affected Jboss ejb client Versions

1 component(s)
Fixed Versions:
4.0.39
Product / Package Ecosystem Affected Versions Fixed Version
org.jboss:jboss-ejb-client
maven/org.jboss/jboss-ejb-client
Maven
< 4.0.39
4.0.39

References

NVD — CVE-2021-20250 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20250
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1929479

Frequently Asked Questions

What is CVE-2021-20250?
CVE-2021-20250 is a security vulnerability in Jboss ejb client involving JBoss EJB Client information disclosure vulnerability under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Jboss ejb client versions are affected?
Affected versions include releases prior to 4.0.39 across affected packages: org.jboss:jboss-ejb-client.
What version fixes CVE-2021-20250?
Upgrading to 4.0.39 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jboss-ejb-client affected?
Yes, org.jboss:jboss-ejb-client is affected in releases prior to 4.0.39. Upgrade your dependency to 4.0.39 or later.
What is the CVSS score of CVE-2021-20250?
CVE-2021-20250 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2021-20250?
CVE-2021-20250 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Maven dependencies for CVE-2021-20250?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jboss'. 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-2259-h742-5vr4",
  "modified" : "2022-08-11T16:52:41Z",
  "published" : "2022-05-24T19:02:23Z",
  "aliases" : [ "CVE-2021-20250" ],
  "summary" : "JBoss EJB Client information disclosure vulnerability",
  "details" : "A flaw was found in wildfly. The JBoss EJB client has publicly accessible privileged actions which may lead to information disclosure on the server it is deployed on. The highest threat from this vulnerability is to data confidentiality.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jboss:jboss-ejb-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.39"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.0.38"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-20250"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1929479"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-22T18:49:54Z",
    "nvd_published_at" : "2021-05-13T14:15:00Z"
  }
}