CVE-2023-39206Network attack vector

Unauthenticated service interruption via buffer overflow

Published Nov 14, 2023 · Updated Aug 29, 2024

A buffer overflow in Zoom Video Communications Zoom Clients before 5.16.0 allows remote attackers to interrupt service via network access. Zoom has not published the affected component, input field, or unchecked copy operation that overruns the destination buffer. No authentication or user interaction is required, but high-complexity conditions limit the reported consequence to client service interruption.

CVSS severity3.7
Low
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Zoom Video Communications Zoom Clients before 5.16.0 allows remote attackers to interrupt service via network access. Zoom has not published the affected component, input field, or unchecked copy operation that overruns the destination buffer. No authentication or user interaction is required, but high-complexity conditions limit the reported consequence to client service interruption.

The record

CVE
CVE-2023-39206
Published
Nov 14, 2023
Updated
Aug 29, 2024
Vendor
Zoom Video Communications, Inc.
Product
Zoom Clients
Classifications
CWE-120, CAPEC-100, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=see references

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

3.7Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC-100Overflow Buffers
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

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Your stack

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