CVE-2023-39203Network attack vector

Client interruption via excessive memory allocation

Published Nov 14, 2023 · Updated Sep 27, 2024

Uncontrolled resource consumption in Zoom Team Chat for Windows and VDI clients allows remote attackers to interrupt the client. Zoom has not disclosed the affected function, network message, or allocation path; its CWE mapping identifies an excessive-size memory allocation. The request is unauthenticated and requires user interaction; Zoom's CVSS reports reduced availability and no confidentiality impact despite the published disclosure wording.

CVSS severity4.3
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Zoom Team Chat for Windows and VDI clients allows remote attackers to interrupt the client. Zoom has not disclosed the affected function, network message, or allocation path; its CWE mapping identifies an excessive-size memory allocation. The request is unauthenticated and requires user interaction; Zoom's CVSS reports reduced availability and no confidentiality impact despite the published disclosure wording.

The record

CVE
CVE-2023-39203
Published
Nov 14, 2023
Updated
Sep 27, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-789, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-789Memory Allocation with Excessive Size Value
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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