Published severityCritical→Operational priority:Critical, unchanged from published severity.unchanged
Evidence used
CISA confirms exploitation in the wild.
A structured source references public exploit or proof-of-concept material.
The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
EPSS is 99.87% for the current model date.
Compensating controls
Restrict the affected network interface to trusted sources where business-safe.
Increase monitoring for the attack path and post-exploitation behaviour described in the report.
Verification
Confirm that the asset runs VMware vCenter Server and falls inside the recorded affected range.
Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
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-2021-9143
CISA KEV mirrored by ENISA
The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 3 Nov 2021. Evidence sources: cisa_kev.
ENISA score
9.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionProtect now
CISA confirms exploitation in the wild and lists 2021-11-17 as the remediation due date.
Fix not verified
01
What, why and how
VMware vCenter Server vSphere Client contains a remote code execution vulnerability in a vCenter Server plugin which allows an attacker with network access to port 443 to execute commands with unrestricted privileges on the underlying operating system.
What
VMware vCenter Server vSphere Client contains a remote code execution vulnerability in a vCenter Server plugin which allows an attacker with network access to port 443 to execute commands with unrestricted privileges on the underlying operating system.
Why
Attacker-controlled path data is not constrained to the intended directory before the application accesses a file.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.
What
VMware vCenter Server vSphere Client contains a remote code execution vulnerability in a vCenter Server plugin which allows an attacker with network access to port 443 to execute commands with unrestricted privileges on the underlying operating system.
Why
Attacker-controlled path data is not constrained to the intended directory before the application accesses a file.
How
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.
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.Confirmed in the wild
CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2021-11-03. Known ransomware campaign use is recorded.
Public PoC / exploit material ?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.Reference recorded
A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.
Likely attack path
a network path → Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') → execute code or commands in the affected security context
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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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:H/I:H/A:H
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.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
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2021-9143Known-exploited evidence recorded
The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
Official EUVD record ↗Canadian Centre for Cyber Security · English · AL21-007APT Actors Target U.S. and Allied Networks - update 1
On 15 April 2021, the NSA, CISA, and FBI issued a Joint Cybersecurity Advisory [ 1 ], drawing attention to widespread scanning and exploitation of several vulnerabilities by APT actors. The advisory states that the APT actors are targeting vulnerable systems to obtain authentication credentials and enable further access within networks, including national security and government systems.
Examples of recent activity include compromising SolarWinds Orion updates, targeting COVID-19 research facilities, and leveraging a VMWare vulnerability for authentication abuse.
The Cybersecurity Advisory highlights the following vulnerabilities being exploited:
CVE-2018-13379 Fortinet [ 2 ], [ 3 ]
CVE-2019-9670 Zimbra [ 3 ]
CVE-2019-11510 Pulse Secure [ 3 ], [ 4 ]
CVE-2019-19781 Citrix [ 3 ]
CVE-2020-4006 VMware [ 5 ]
UPDATE 1 [ 6 ]
CVE-2020-5902 F5 Big-IP
CVE-2020-14882 Oracle WebLogic
CVE-2021-21972 VMWare vSphere
CVE-2019-1653 Cisco router
CVE-2019-2725 Oracle WebLogic Server
CVE-2019-7609 Kibana
CVE-2021-26857 Exchange (SOAP payload)
CVE-2021-26858 Exchange (Arbitrary files)
CVE-2021-27065 Exchange (Arbitrary files)
The Cyber Centre is highlighting this advisory, as it provides important information to system owners and operators responsible for defending their systems and networks from cyber threats.
There are software updates and mitigations for these vulnerabilities. See past reporting by the Cyber Center and partners for more details.
Should activity matching the content of this Alert be discovered, recipients are encouraged to contact the Cyber Centre by email ( contact@cyber.gc.ca ) or by telephone ( 1-833-CYBER-88 or 1-833-292-3788 ).
Official advisory ↗Cyber Security Agency of Singapore · English · CSA-SB-20210303Security Bulletin 03 Mar 2021
The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 03 Mar 2021, published on 3 March 2021. Open the linked bulletin for the product, severity and reference information published in that issue.
Official advisory ↗CERT-FR · French · CERTFR-2021-AVI-145Multiples vulnérabilités dans les produits VMWare
De multiples vulnérabilités ont été découvertes dans les produits
VMWare. Elles permettent à un attaquant de provoquer une exécution de
code arbitraire à distance.
Official advisory ↗JVN iPedia · Japanese · JVNDB-2021-001341VMware vCenter Server および Cloud Foundation における権限管理に関する脆弱性
VMware vCenter Server および Cloud Foundation には、権限管理に関する脆弱性が存在します。
Official advisory ↗KISA KrCERT/CC · Korean · KNVD-5873최근 해킹 공격에 활용되는 취약점 보안 업데이트 권고
IG-IP에서 iControl REST 인증 미흡으로 인해 발생하는 불충분한 인가 취약점(CVE-2022-1388)[11]
ㅇ BIG-IP, BIG-IQ의 iControl REST 인터페이스에서 발생하는 원격 코드 실행 취약점(CVE-2021-22986)[12]
ㅇ Grafana 소프트웨어에서 경로탐색(Directory Traversal)으로 인해 발생하는 정보노출 취약점(CVE-2021-43798)[13]
ㅇ Inspur ClusterEngine V4.0에서 발생하는 원격 코드 실행 취약점(CVE-2020-21224)[14]
ㅇ Oracle WebLogic Server에서 발생하는 원격 코드 실행 취약점(CVE-2021-2109)[15]
ㅇ SMBv3 프로토콜이 조작된 패킷을 처리할 때 버퍼오버플로우로 인해 발생하는 원격코드실행 취약점(CVE-2020-0796)[16]
ㅇ Spring Cloud Gateway에서 발생하는 원격코드 실행 취약점(CVE-2022-22947)[17]
ㅇ Spring Core에서 발생하는 원격코드실행 취약점(CVE-2022-22965)[18]
ㅇ Spring Cloud Function에서 발생하는 원격코드실행 취약점(CVE-2022-22963)[18]
ㅇ VMware vCenter Server 원격 코드 실행 취약점(CVE-2021-21972)[19]
ㅇ VMware vCenter Server 에서 발생하는 파일 업로드 취약점(CVE-2021-22005)[20]
ㅇ VMware Workspace ONE Access와 Identity Manager에서 발생하는 원격 코드 실행 취약점(CVE-2022-22954)[21]
ㅇ WebLogic Server에서 안전하지 않은 역직렬화로 인해 발생하는 인증 우회 및 원격코드 실행 취약점(CVE-2019-2725)[22]
ㅇ WSO2에서 발생하는 원격코드 실행 취약점(CVE-2022-29464)[23]
##### □ 해결 방안
o 취약점별 참고사이트[1]~[23]에 명시되어 있는 내용을 참조하여 업데이트 수행
##### □ 기타 문의사항
o 한국인터넷진흥원 사이버민원센터: 국번없이 118
[참고사이트]
[1]
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45232
[2]
https://boho.or.kr/data/secNoticeView.do?bulletin_writing_sequence=36279
[3]
https://boho.or.kr/data/secNoticeView.do?bulletin_writing_sequence=36277
[4]
https://cve.mitre.org/cgi-bi
Official advisory ↗KISA KrCERT/CC · Korean · KNVD-5268VMware 제품 취약점 보안 업데이트 권고
#### VMware 제품 취약점 보안 업데이트 권고 2021.02.25
##### □ 개요
o VMware 社는 자사 제품에서 발생하는 취약점을 해결한 보안 업데이트 발표 [1]
o 공격자는 해당 취약점을 악용하여 원격코드실행 등의 피해를 발생시킬 수 있으므로, 최신버전으로 업데이트 권고
##### □ 주요 내용 [1]
CVE ID
내용
심각도(CVSSv3)
CVE-2021-21972
vCenter 서버 플러그인에서 발생하는 원격코드실행 취약점
Critical(9.8)
CVE-2021-21973
vCenter 서버 플러그인에서 URL에 대한 검증이 미흡하여 발생하는 SSRF 취약점
Moderate(5.3)
CVE-2021-21974
ESXI의 OpenSLP에서 힙오버플로우로 인해 발생하는 원격코드실행 취약점
High(8.8)
##### □ 영향받는 제품 및 해결 버전
제품명
플랫폼
영향 받는 버전
최신 패치 버전
vCenter Server
모든 플랫폼
6.5
6.5 U3n
6.7
6.7 U3l
7.0
7.0 U1c
Cloud Foundation
(vCenter Server)
모든 플랫폼
3.x
3.10.1.2
4.x
4.2
ESXi
모든 플랫폼
6.5
ESXi650-202102101-SG
6.7
ESXi670-202102401-SG
7.0
ESXi70U1c-17325551
Cloud Foundation
(ESXi)
모든 플랫폼
3.x
[2] 참고
4.x
4.2
##### □ 해결 방안
o 참고사이트[1]에 명시되어 있는 ‘Reference’ 내용을 참고하여 패치 적용
##### □ 기타 문의사항
o 한국인터넷진흥원 사이버민원센터: 국번없이 118
[참고사이트]
[1]
https://www.vmware.com/security/
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
VMware vCenter Server: 7.x before 7.0 U1c, 6.7 before 6.7 U3l, 6.5 before 6.5 U3n
VMware Cloud Foundation: 4.x before 4.2, 3.x before 3.10.1.2
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 24 Feb 2021 · Last source change 12 Aug 2026, 03:55 UTC · CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVE recordCVE.org · 5.2
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-2021-9143
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Affected versionsThe structured affected or fixed version information changed.
Before
7.x before 7.0 U1c; 6.7 before 6.7 U3l; 6.5 before 6.5 U3n; 4.x before 4.2; 3.x before 3.10.1.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
VMware vCenter Server: 7.x before 7.0 U1c, 6.7 before 6.7 U3l, 6.5 before 6.5 U3n; VMware Cloud Foundation: 4.x before 4.2, 3.x before 3.10.1.2 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
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.