CVE-2023-39208Network attack vector

Unauthenticated client denial of service

Published Sep 12, 2023 · Updated Sep 27, 2024

Improper input validation in Zoom Desktop Client for Linux before 5.15.10 allows remote attackers to crash the client via network access. Zoom has not published the affected input-processing locus or the validation operation that mishandles network data. No authentication or user interaction is required, but Zoom has not disclosed whether denial of service occurs through a crash, hang, or another failure mode.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Zoom Desktop Client for Linux before 5.15.10 allows remote attackers to crash the client via network access. Zoom has not published the affected input-processing locus or the validation operation that mishandles network data. No authentication or user interaction is required, but Zoom has not disclosed whether denial of service occurs through a crash, hang, or another failure mode.

The record

CVE
CVE-2023-39208
Published
Sep 12, 2023
Updated
Sep 27, 2024
Vendor
Zoom Video Communications, Inc.
Product
Zoom Workplace Desktop App
Classifications
CWE-20, CWE-79, T1499
Attack vector
network
Privileges
unauthenticated

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=before version 5.15.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zoom Video Communications, Inc. · Zoom Workplace Desktop Appversion=before version 5.15.10

Published CVSS scores

6.5Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
7.5NIST NVDCVSS: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-20Improper Input Validation
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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