CVE-2023-39215Network attack vector

Authenticated client interruption via improper authentication

Published Sep 12, 2023 · Updated Sep 27, 2024

Improper authentication in Zoom Clients allows remote authenticated users to interrupt affected clients through network access. Zoom has not published the affected request, authentication decision, or client action that causes the denial of service. A valid Zoom account and network reachability are required; the documented consequence is client service interruption, with no integrity impact.

CVSS severity7.1
High
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper authentication in Zoom Clients allows remote authenticated users to interrupt affected clients through network access. Zoom has not published the affected request, authentication decision, or client action that causes the denial of service. A valid Zoom account and network reachability are required; the documented consequence is client service interruption, with no integrity impact.

The record

CVE
CVE-2023-39215
Published
Sep 12, 2023
Updated
Sep 27, 2024
Vendor
Zoom Video Communications, Inc.
Product
Zoom Clients
Classifications
CWE-287, CWE-449, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=see reference

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zoom Video Communications, Inc. · Zoom Clientsversion=see reference

Published CVSS scores

7.1Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
6.5National Institute of Standards and TechnologyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-449The UI Performs the Wrong Action
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo