CVE-2023-39204Network attack vector

Client interruption via undisclosed buffer overflow

Published Nov 14, 2023 · Updated Aug 29, 2024

Buffer overflow in Zoom desktop clients before 5.15.10 allows remote attackers to interrupt the application via network input. Zoom has not disclosed the affected component, the oversized input, or the copy operation that overruns its destination buffer. Exploitation requires user interaction and causes service interruption, with no reported data disclosure or modification.

CVSS severity4.3
Medium
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Zoom desktop clients before 5.15.10 allows remote attackers to interrupt the application via network input. Zoom has not disclosed the affected component, the oversized input, or the copy operation that overruns its destination buffer. Exploitation requires user interaction and causes service interruption, with no reported data disclosure or modification.

The record

CVE
CVE-2023-39204
Published
Nov 14, 2023
Updated
Aug 29, 2024
Vendor
Zoom Video Communications, Inc.
Product
Zoom Clients
Classifications
CWE-120, T1499.004
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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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')
T1499.004Application or System Exploitation

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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