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Full vulnerability report · 2022
CVE-2021-3717High confidence

A flaw was found in Wildfly

Unknown · wildfly

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Medium, lowered one band.downgradedsince 3 Aug 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.31% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Unknown wildfly and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2021-3717 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitywildfly: incorrect JBOSS_LOCAL_USER challenge location may lead to giving access to all the local users
12 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • wildfly as a component of Red Hat Data Grid 8
  • wildfly as a component of Red Hat Integration Camel K 1
  • wildfly as a component of Red Hat Integration Service Registry
  • wildfly as a component of Red Hat JBoss Data Grid 7
  • jbossas as a component of Red Hat JBoss Data Virtualization 6
  • wildfly as a component of Red Hat JBoss Data Virtualization 6
  • jbossas as a component of Red Hat JBoss Enterprise Application Platform 5
  • jbossas as a component of Red Hat JBoss Enterprise Application Platform 6
  • wildfly as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack
  • wildfly as a component of Red Hat JBoss Fuse 6
  • wildfly as a component of Red Hat JBoss Operations Network 3
  • jbossas as a component of Red Hat JBoss SOA Platform 5
Summary
A flaw was found in Wildfly. An incorrect JBOSS_LOCAL_USER challenge location when using the elytron configuration may lead to JBOSS_LOCAL_USER access to all users on the machine. The highest threat from this vulnerability is to confidentiality, integrity, and availability.
Remediation
Before applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2022-4736

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A flaw was found in Wildfly. An incorrect JBOSS_LOCAL_USER challenge location when using the elytron configuration may lead to JBOSS_LOCAL_USER access to all users on the machine. The highest threat from this vulnerability is to confidentiality, integrity, and availability. This flaw affects wildfly-core versions prior to 17.0.

What

A flaw was found in Wildfly. An incorrect JBOSS_LOCAL_USER challenge location when using the elytron configuration may lead to JBOSS_LOCAL_USER access to all users on the machine. The highest threat from this vulnerability is to confidentiality, integrity, and availability. This flaw affects wildfly-core versions prior to 17.0.

Why

A file or directory that should be restricted can be reached by an external party because its access controls or placement are unsafe.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A flaw was found in Wildfly. An incorrect JBOSS_LOCAL_USER challenge location when using the elytron configuration may lead to JBOSS_LOCAL_USER access to all users on the machine. The highest threat from this vulnerability is to confidentiality, integrity, and availability. This flaw affects wildfly-core versions prior to 17.0.

Why

A file or directory that should be restricted can be reached by an external party because its access controls or placement are unsafe.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Files or Directories Accessible to External Parties → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-552 ↗

CWE-552: Files or Directories Accessible to External Parties. The product makes files or directories accessible to unauthorized actors, even though they should not be.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-552
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2022-0726Red Hat JBoss Enterprise Application Platform: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat JBoss Enterprise Application Platform ausnutzen, um einen Denial of Service Angriff durchzuführen oder die Vertraulichkeit und Integrität zu gefährden.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20220525Security Bulletin 25 May 2022

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 25 May 2022, published on 25 May 2022. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-019745複数のレッドハット製品における外部からアクセス可能なファイルまたはディレクトリに関する脆弱性

JBoss Enterprise Application Platform、Single Sign-On、WildFly Core 等複数のレッドハット製品には、外部からアクセス可能なファイルまたはディレクトリに関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
Before applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 24 May 2022 · Last source change 3 Aug 2024, 17:01 UTC · CWE-552 · Files or Directories Accessible to External Parties

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2022-4736
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    wildfly-core 17.0 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    wildfly-core 17.0 · Fixed: Before applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    wildfly as a component of Red Hat Data Grid 8; wildfly as a component of Red Hat Integration Camel K 1; wildfly as a component of Red Hat Integration Service Registry; wildfly as a component of Red Hat JBoss Data Grid 7; jbossas as a component of Red Hat JBoss Data Virtualization 6; wildfly as a component of Red Hat JBoss Data Virtualization 6; jbossas as a component of Red Hat JBoss Enterprise Application Platform 5; jbossas as a component of Red Hat JBoss Enterprise Application Platform 6; wildfly as a component of Red Hat JBoss Fuse 6; wildfly as a component of Red Hat JBoss Operations Network 3; jbossas as a component of Red Hat JBoss SOA Platform 5 · Fixed: eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-rt-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-services-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-tools-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-api-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-impl-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-spi-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-core-api-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-core-impl-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-deployers-common-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-jdbc-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-validator-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-cli-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-core-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap6.4-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap6.4-to-eap7.3-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.0-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.1-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.2-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.2-to-eap7.3-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.3-server-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; and 261 more
    After
    wildfly as a component of Red Hat Data Grid 8; wildfly as a component of Red Hat Integration Camel K 1; wildfly as a component of Red Hat Integration Service Registry; wildfly as a component of Red Hat JBoss Data Grid 7; jbossas as a component of Red Hat JBoss Data Virtualization 6; wildfly as a component of Red Hat JBoss Data Virtualization 6; jbossas as a component of Red Hat JBoss Enterprise Application Platform 5; jbossas as a component of Red Hat JBoss Enterprise Application Platform 6; wildfly as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack; wildfly as a component of Red Hat JBoss Fuse 6; wildfly as a component of Red Hat JBoss Operations Network 3; jbossas as a component of Red Hat JBoss SOA Platform 5 · Fixed: eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-0:3.3.12-1.redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-rt-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-services-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-apache-cxf-tools-0:3.3.12-1.redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-0:1.5.3-1.Final_redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-api-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-impl-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-common-spi-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-core-api-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-core-impl-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-deployers-common-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-jdbc-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-ironjacamar-validator-0:1.5.3-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jakarta-el-0:3.0.3-3.redhat_00007.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-ejb-client-0:4.0.43-1.Final_redhat_00001.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-0:1.7.2-10.Final_redhat_00011.1.el6eap.src as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-cli-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-core-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap6.4-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap6.4-to-eap7.3-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.0-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.1-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.2-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.2-to-eap7.3-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; eap7-jboss-server-migration-eap7.3-server-0:1.7.2-10.Final_redhat_00011.1.el6eap.noarch as a component of Red Hat JBoss EAP 7.3 for RHEL 6 Server; and 261 more
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2022-4736↗Red Hat Product Security security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2021-3717 · cve.blacktree.nl