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Full vulnerability report · 2022
CVE-2022-21340High confidence

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Libraries)

Oracle Corporation · Java SE JDK and JRE

5.3MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archiveicedtea-webUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 11 Sept 2026
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2022-26565

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 actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Fix not verified
01

What, why and how

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Libraries). Supported versions that are affected are Oracle Java SE: 7u321, 8u311, 11.0.13, 17.0.1; Oracle GraalVM Enterprise Edition: 20.3.4 and 21.3.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

What

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Libraries). Supported versions that are affected are Oracle Java SE: 7u321, 8u311, 11.0.13, 17.0.1; Oracle GraalVM Enterprise Edition: 20.3.4 and 21.3.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Libraries). Supported versions that are affected are Oracle Java SE: 7u321, 8u311, 11.0.13, 17.0.1; Oracle GraalVM Enterprise Edition: 20.3.4 and 21.3.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Why

The product does not properly control the allocation and maintenance of a limited resource.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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
a network path → Uncontrolled Resource Consumption → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
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-400 ↗

CWE-400: Uncontrolled Resource Consumption. The product does not properly control the allocation and maintenance of a limited resource.

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

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

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-400
A

Official authority intelligence

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

BSI · German · WID-SEC-2022-0432Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um die Vertraulichkeit, Verfügbarkeit und Integrität zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2022-0302Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode mit Administratorrechten

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um beliebigen Programmcode auszuführen, einen Cross-Site-Scripting-Angriff durchzuführen, Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2023-0838Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um beliebigen Programmcode auszuführen, einen Cross-Site-Scripting-Angriff durchzuführen, Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen oder Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2023-0839Xerox FreeFlow Print Server: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um beliebigen Programmcode auszuführen, einen Cross-Site-Scripting-Angriff durchzuführen, Informationen offenzulegen, einen Denial of Service Zustand herbeizuführen oder Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2022-0812IBM Java: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Java ausnutzen, um einen Denial of Service Angriff durchzuführen oder unbekannte Auswirkungen zu verursachen.

Official advisory ↗
BSI · German · WID-SEC-2022-0100Oracle Java SE und OpenJDK: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Oracle Java SE und OpenJDK ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20220126Security Bulletin 26 Jan 2022

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 26 Jan 2022, published on 26 January 2022. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-1131Multiples vulnérabilités dans les produits IBM

d?id=CVE-2021-28861 Référence CVE CVE-2021-47621 https://www.cve.org/CVERecord?id=CVE-2021-47621 Référence CVE CVE-2022-21248 https://www.cve.org/CVERecord?id=CVE-2022-21248 Référence CVE CVE-2022-21282 https://www.cve.org/CVERecord?id=CVE-2022-21282 Référence CVE CVE-2022-21293 https://www.cve.org/CVERecord?id=CVE-2022-21293 Référence CVE CVE-2022-21294 https://www.cve.org/CVERecord?id=CVE-2022-21294 Référence CVE CVE-2022-21296 https://www.cve.org/CVERecord?id=CVE-2022-21296 Référence CVE CVE-2022-21299 https://www.cve.org/CVERecord?id=CVE-2022-21299 Référence CVE CVE-2022-21305 https://www.cve.org/CVERecord?id=CVE-2022-21305 Référence CVE CVE-2022-21340 https://www.cve.org/CVERecord?id=CVE-2022-21340 Référence CVE CVE-2022-21341 https://www.cve.org/CVERecord?id=CVE-2022-21341 Référence CVE CVE-2022-21349 https://www.cve.org/CVERecord?id=CVE-2022-21349 Référence CVE CVE-2022-21360 https://www.cve.org/CVERecord?id=CVE-2022-21360 Référence CVE CVE-2022-21365 https://www.cve.org/CVERecord?id=CVE-2022-21365 Référence CVE CVE-2022-25927 https://www.cve.org/CVERecord?id=CVE-2022-25927 Référence CVE CVE-2022-30635 https://www.cve.org/CVERecord?id=CVE-2022-30635 Référence CVE CVE-2022-3171 https://www.cve.org/CVERecord?id=CVE-2022-3171 Référence CVE CVE-2022-3509 https://www.cve.org/CVERecord?id=CVE

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0969Multiples vulnérabilités dans les produits VMware

d?id=CVE-2022-21271 Référence CVE CVE-2022-21282 https://www.cve.org/CVERecord?id=CVE-2022-21282 Référence CVE CVE-2022-21283 https://www.cve.org/CVERecord?id=CVE-2022-21283 Référence CVE CVE-2022-21291 https://www.cve.org/CVERecord?id=CVE-2022-21291 Référence CVE CVE-2022-21293 https://www.cve.org/CVERecord?id=CVE-2022-21293 Référence CVE CVE-2022-21294 https://www.cve.org/CVERecord?id=CVE-2022-21294 Référence CVE CVE-2022-21296 https://www.cve.org/CVERecord?id=CVE-2022-21296 Référence CVE CVE-2022-21299 https://www.cve.org/CVERecord?id=CVE-2022-21299 Référence CVE CVE-2022-21305 https://www.cve.org/CVERecord?id=CVE-2022-21305 Référence CVE CVE-2022-21340 https://www.cve.org/CVERecord?id=CVE-2022-21340 Référence CVE CVE-2022-21341 https://www.cve.org/CVERecord?id=CVE-2022-21341 Référence CVE CVE-2022-21349 https://www.cve.org/CVERecord?id=CVE-2022-21349 Référence CVE CVE-2022-21360 https://www.cve.org/CVERecord?id=CVE-2022-21360 Référence CVE CVE-2022-21365 https://www.cve.org/CVERecord?id=CVE-2022-21365 Référence CVE CVE-2022-21366 https://www.cve.org/CVERecord?id=CVE-2022-21366 Référence CVE CVE-2022-21426 https://www.cve.org/CVERecord?id=CVE-2022-21426 Référence CVE CVE-2022-21434 https://www.cve.org/CVERecord?id=CVE-2022-21434 Référence CVE CVE-2022-21443 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0967Multiples vulnérabilités dans les produits VMware

d?id=CVE-2022-21248 Référence CVE CVE-2022-21271 https://www.cve.org/CVERecord?id=CVE-2022-21271 Référence CVE CVE-2022-21282 https://www.cve.org/CVERecord?id=CVE-2022-21282 Référence CVE CVE-2022-21291 https://www.cve.org/CVERecord?id=CVE-2022-21291 Référence CVE CVE-2022-21293 https://www.cve.org/CVERecord?id=CVE-2022-21293 Référence CVE CVE-2022-21294 https://www.cve.org/CVERecord?id=CVE-2022-21294 Référence CVE CVE-2022-21296 https://www.cve.org/CVERecord?id=CVE-2022-21296 Référence CVE CVE-2022-21299 https://www.cve.org/CVERecord?id=CVE-2022-21299 Référence CVE CVE-2022-21305 https://www.cve.org/CVERecord?id=CVE-2022-21305 Référence CVE CVE-2022-21340 https://www.cve.org/CVERecord?id=CVE-2022-21340 Référence CVE CVE-2022-21341 https://www.cve.org/CVERecord?id=CVE-2022-21341 Référence CVE CVE-2022-21349 https://www.cve.org/CVERecord?id=CVE-2022-21349 Référence CVE CVE-2022-21360 https://www.cve.org/CVERecord?id=CVE-2022-21360 Référence CVE CVE-2022-21365 https://www.cve.org/CVERecord?id=CVE-2022-21365 Référence CVE CVE-2022-21426 https://www.cve.org/CVERecord?id=CVE-2022-21426 Référence CVE CVE-2022-21434 https://www.cve.org/CVERecord?id=CVE-2022-21434 Référence CVE CVE-2022-21476 https://www.cve.org/CVERecord?id=CVE-2022-21476 Référence CVE CVE-2022-21540 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0514Multiples vulnérabilités dans les produits IBM

rd?id=CVE-2021-2163 Référence CVE CVE-2021-32052 https://www.cve.org/CVERecord?id=CVE-2021-32052 Référence CVE CVE-2022-21248 https://www.cve.org/CVERecord?id=CVE-2022-21248 Référence CVE CVE-2022-21282 https://www.cve.org/CVERecord?id=CVE-2022-21282 Référence CVE CVE-2022-21293 https://www.cve.org/CVERecord?id=CVE-2022-21293 Référence CVE CVE-2022-21294 https://www.cve.org/CVERecord?id=CVE-2022-21294 Référence CVE CVE-2022-21296 https://www.cve.org/CVERecord?id=CVE-2022-21296 Référence CVE CVE-2022-21299 https://www.cve.org/CVERecord?id=CVE-2022-21299 Référence CVE CVE-2022-21305 https://www.cve.org/CVERecord?id=CVE-2022-21305 Référence CVE CVE-2022-21340 https://www.cve.org/CVERecord?id=CVE-2022-21340 Référence CVE CVE-2022-21341 https://www.cve.org/CVERecord?id=CVE-2022-21341 Référence CVE CVE-2022-21349 https://www.cve.org/CVERecord?id=CVE-2022-21349 Référence CVE CVE-2022-21360 https://www.cve.org/CVERecord?id=CVE-2022-21360 Référence CVE CVE-2022-21365 https://www.cve.org/CVERecord?id=CVE-2022-21365 Référence CVE CVE-2022-21476 https://www.cve.org/CVERecord?id=CVE-2022-21476 Référence CVE CVE-2022-21540 https://www.cve.org/CVERecord?id=CVE-2022-21540 Référence CVE CVE-2022-21541 https://www.cve.org/CVERecord?id=CVE-2022-21541 Référence CVE CVE-2022-34169 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2023-AVI-0051Multiples vulnérabilités dans les produits Juniper

d?id=CVE-2022-21277 Référence CVE CVE-2022-21282 https://www.cve.org/CVERecord?id=CVE-2022-21282 Référence CVE CVE-2022-21283 https://www.cve.org/CVERecord?id=CVE-2022-21283 Référence CVE CVE-2022-21291 https://www.cve.org/CVERecord?id=CVE-2022-21291 Référence CVE CVE-2022-21293 https://www.cve.org/CVERecord?id=CVE-2022-21293 Référence CVE CVE-2022-21294 https://www.cve.org/CVERecord?id=CVE-2022-21294 Référence CVE CVE-2022-21296 https://www.cve.org/CVERecord?id=CVE-2022-21296 Référence CVE CVE-2022-21299 https://www.cve.org/CVERecord?id=CVE-2022-21299 Référence CVE CVE-2022-21305 https://www.cve.org/CVERecord?id=CVE-2022-21305 Référence CVE CVE-2022-21340 https://www.cve.org/CVERecord?id=CVE-2022-21340 Référence CVE CVE-2022-21341 https://www.cve.org/CVERecord?id=CVE-2022-21341 Référence CVE CVE-2022-21349 https://www.cve.org/CVERecord?id=CVE-2022-21349 Référence CVE CVE-2022-21360 https://www.cve.org/CVERecord?id=CVE-2022-21360 Référence CVE CVE-2022-21365 https://www.cve.org/CVERecord?id=CVE-2022-21365 Référence CVE CVE-2022-21366 https://www.cve.org/CVERecord?id=CVE-2022-21366 Référence CVE CVE-2022-21426 https://www.cve.org/CVERecord?id=CVE-2022-21426 Référence CVE CVE-2022-21434 https://www.cve.org/CVERecord?id=CVE-2022-21434 Référence CVE CVE-2022-21443 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-544Multiples vulnérabilités dans IBM Netcool Operations Insight

De multiples vulnérabilités ont été découvertes dans IBM Netcool Operations Insight. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-459Multiples vulnérabilités dans les produits IBM

De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à l'intégrité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-051Multiples vulnérabilités dans Oracle Java SE

De multiples vulnérabilités ont été découvertes dans Oracle Java SE. Elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à l'intégrité des données et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2022-001290Oracle Java SE および Oracle GraalVM Enterprise Edition における Libraries に関する脆弱性

Oracle Java SE および Oracle GraalVM Enterprise Edition には、Libraries に関する処理に不備があるため、可用性に影響のあ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.
Fix not verified
Affected
Java SE JDK and JRE: Oracle Java SE:7u321, Oracle Java SE:8u311, Oracle Java SE:11.0.13, Oracle Java SE:17.0.1, Oracle GraalVM Enterprise Edition:20.3.4, Oracle GraalVM Enterprise Edition:21.3.0
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 19 Jan 2022 · Last source change 27 May 2026, 15:09 UTC · CWE-400 · Uncontrolled Resource Consumption

CVE recordCVE.org · 5.2
CVSS sourceCNA
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-2022-26565
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2022-26565↗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-2022-21340 · cve.blacktree.nl