CVE-2021-20250Network attack vector

Authenticated system-property disclosure via public privileged helper

Published May 13, 2021 · Updated Aug 3, 2024

Information exposure in WildFly JBoss EJB Client before 4.0.39 allows remote authenticated users to read Java system properties. The public org.jboss.ejb._private.SystemProperties helper wraps arbitrary property-name reads in AccessController.doPrivileged, allowing calling code to bypass SecurityManager restrictions. Exploitation requires code able to invoke the client library on a server; the reported consequence is disclosure of system-property data, not modification or service interruption.

CVSS severity4.3
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in WildFly JBoss EJB Client before 4.0.39 allows remote authenticated users to read Java system properties. The public org.jboss.ejb._private.SystemProperties helper wraps arbitrary property-name reads in AccessController.doPrivileged, allowing calling code to bypass SecurityManager restrictions. Exploitation requires code able to invoke the client library on a server; the reported consequence is disclosure of system-property data, not modification or service interruption.

The record

CVE
CVE-2021-20250
Published
May 13, 2021
Updated
Aug 3, 2024
Vendor
WildFly
Product
JBoss EJB Client
Classifications
CWE-200, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=jboss-ejb-client 4.0.39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WildFly · JBoss EJB Clientversion=jboss-ejb-client 4.0.39

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NVDAV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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