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Full vulnerability report · 2020
CVE-2020-6109High confidence

An exploitable path traversal vulnerability exists in the Zoom client, version 4.6.10 processes messages including animated GIFs

Unknown · Zoom

9.8CriticalCVSS 3.1
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • 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 4.72% 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

  1. Confirm that the asset runs Unknown Zoom and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  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: Within 3 daysRemediation target: Within 90 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.

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-2020-27263

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 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
01

What, why and how

An exploitable path traversal vulnerability exists in the Zoom client, version 4.6.10 processes messages including animated GIFs. A specially crafted chat message can cause an arbitrary file write, which could potentially be abused to achieve arbitrary code execution. An attacker needs to send a specially crafted message to a target user or a group to exploit this vulnerability.

What

An exploitable path traversal vulnerability exists in the Zoom client, version 4.6.10 processes messages including animated GIFs. A specially crafted chat message can cause an arbitrary file write, which could potentially be abused to achieve arbitrary code execution. An attacker needs to send a specially crafted message to a target user or a group to exploit this vulnerability.

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

An exploitable path traversal vulnerability exists in the Zoom client, version 4.6.10 processes messages including animated GIFs. A specially crafted chat message can cause an arbitrary file write, which could potentially be abused to achieve arbitrary code execution. An attacker needs to send a specially crafted message to a target user or a group to exploit this vulnerability.

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.
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.
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 ↗

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.
NetworkUnauthenticatedRemote code executionCWE-22Public exploit reference
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20200610Security Bulletin 10 Jun 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 Jun 2020, published on 10 June 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-006307Zoom client におけるパストラバーサルの脆弱性

Zoom client には、パストラバーサルの脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5251주요 보안 취약점 업데이트를 재확인 하세요!!

500,5500 원격코드 실행 취약점 [3] 4 운영체제 CVE-2020-7247 - OpenSMTPD 원격코드 실행 취약점 [4] 5 운영체제 CVE-2020-0674 MS 인터넷 익스플로러 원격코드 실행 취약점 [5] 6 운영체제 CVE-2020-0688 MS 윈도우 Exchange 서버 원격코드 실행 취약점 [6] 7 운영체제 CVE-2020-0796 MS 윈도우 SMBv3 원격코드 실행 취약점 [7] 8 운영체제 CVE-2019-14287 유닉스/리눅스 - sudo 명령어 취약점 [8] 9 운영체제 CVE-2020-1472 MS 윈도우 서버 Netlogon 권한상승 취약점 [9] 10 가상화 CVE-2020-3943 외 2개 VMware vRealize Operations 임의코드 실행 취약점 등 [10] 11 가상화 CVE-2020-3952 VMware vCenter Server 정보유노출 취약점 [11] 12 웹서버 CVE-2020-1938 Apache Tomcat 원격코드 실행 취약점 [12] 13 보안솔루션 CVE-2020-7845 지란지교시큐리티 스팸스나이퍼 버퍼오버플로우 취약점 [13] 14 보안솔루션 CVE-2020-25043 외 11개 Kaspersky 등 7개사 백신프로그램 임의파일 삭제 취약점 등 [14] 15 원격협업 CVE-2020-6109 외 1개 Zoom Zoom 임의파일 쓰기 취약점 [15] 16 원격협업 CVE-2020-8207 Citrix Workspace 권한 상승 취약점 [16] 17 원격협업 CVE-2020-13699 Team Viewer TeamViewer 원격코드 실행 취약점 [17] 18 IoT CVE-2020-10173 외 10개 LG 등 9개사 공유기, IP카메라 등 악성코드 유포, DDoS [18] 19 복합기 CVE-2018-5924 HP HP DesignJet 원격코드 실행 취약점 [19] 20 솔루션 CVE-2019-0708 외 24개 MS 등 14개사 운영체제, 보안솔루션 등 임의코드 실행 취약점 등 [20] 21 솔루션 - 위즈베라 Veraport 설치프로그램을 악용한 악성코드 유포 [21] 22 솔루션 - 솔라윈즈 솔라윈즈 오리온 제품 업데이트 과정에서 악성코드 배포 가능 [22] [참고사이트] [1] tools.cisco.com/security/center/Content/CiscoSecurityAdvisory/cisco-sa-20200102-dcnm-comm-inject https://www.krcert.or.kr/data/secNoticeView.do?bulletin_writing_sequence=35237 [2] www.citrix.com/

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5140Zoom 취약점 보안 업데이트 권고

#### Zoom 취약점 보안 업데이트 권고 2020.06.08 ##### □ 개요 o Zoom 社는 자사 제품의 취약점을 해결한 보안 업데이트 공개 o 공격자는 해당 취약점을 이용하여 원격코드 실행 등의 피해를 발생시킬 수 있으므로, 해당 제품을 사용하는 이용자들은 최신 버전으로 업데이트 권고 ##### □ 주요 내용 o Zoom 클라이언트에서 애니메이션 GIF 메시지에 대한 검증이 미흡하여 공격자가 악성파일을 피해자의 시스템에 저장할 수 있는 임의 파일 쓰기 취약점(CVE-2020-6109) [1] o Zoom 클라이언트에서 확장프로그램 사용시 ZIP파일에 대한 검증 기능이 부재하여 발생하는 임의 파일 쓰기 취약점(CVE-2020-6110) [2] ##### □ 영향받는 제품 o Zoom Client 4.6.10 ##### □ 해결 방안 o 취약점이 해결된 버전(4.6.12 이상 버전)으로 업데이트 수행 [3] ##### □ 기타 문의사항 o 한국인터넷진흥원 사이버민원센터: 국번없이 118 [참고사이트] [1] https://talosintelligence.com/vulnerability_reports/TALOS-2020-1055 [2] https://talosintelligence.com/vulnerability_reports/TALOS-2020-1056 [3] https://zoom.us/download ##### □ 작성 : 침해사고분석단 취약점분석팀

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
Zoom: Zoom Client Application 4.6.10
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 8 Jun 2020 · Last source change 4 Aug 2024, 08:47 UTC · CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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-2020-27263
Product sourceCNA
Remediation sourceCVE/CNA references
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 ↗

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
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-2020-6109 · cve.blacktree.nl