CVE-2020-1729

ClassLoader access via public privileged utility

Published May 28, 2021 · Updated Aug 4, 2024

Incorrect authorization in Red Hat SmallRye Config 1.6.1 and earlier allows local users to obtain the thread context ClassLoader. The public SecuritySupport.getContextClassLoader() method invokes Thread.currentThread().getContextClassLoader() through AccessController.doPrivileged(), granting the library's permission context to calling application code. Exploitation requires code execution inside a SecurityManager-enabled application server and exposes data reachable through the returned ClassLoader without reported integrity or availability impact.

CVSS severity4.4
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Red Hat SmallRye Config 1.6.1 and earlier allows local users to obtain the thread context ClassLoader. The public SecuritySupport.getContextClassLoader() method invokes Thread.currentThread().getContextClassLoader() through AccessController.doPrivileged(), granting the library's permission context to calling application code. Exploitation requires code execution inside a SecurityManager-enabled application server and exposes data reachable through the returned ClassLoader without reported integrity or availability impact.

The record

CVE
CVE-2020-1729
Published
May 28, 2021
Updated
Aug 4, 2024
Vendor
Red Hat
Product
SmallRye Config
Classifications
CWE-863
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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  1. Affected versionversion=SmallRye 1.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Red Hat · SmallRye Configversion=SmallRye 1.6.1

Published CVSS scores

4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
4.0GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

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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