CVE-2023-34121Network attack vector

Authenticated privilege escalation

Published Jun 13, 2023 · Updated Jan 2, 2025

Improper input validation in Zoom Windows clients before 5.14.0 allows remote authenticated users to escalate privileges via network access. Zoom has not disclosed the affected component, the untrusted input, or the validation operation that fails. Exploitation requires an authenticated network session and user interaction; no ability to modify data or interrupt service is reported.

CVSS severity4.1
Medium
EPSS probability0.95%
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 Windows clients before 5.14.0 allows remote authenticated users to escalate privileges via network access. Zoom has not disclosed the affected component, the untrusted input, or the validation operation that fails. Exploitation requires an authenticated network session and user interaction; no ability to modify data or interrupt service is reported.

The record

CVE
CVE-2023-34121
Published
Jun 13, 2023
Updated
Jan 2, 2025
Vendor
Zoom Video Communications, Inc.
Product
Zoom Rooms Client for Windows
Classifications
CWE-79, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record 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=before 5.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zoom Video Communications, Inc. · Zoom Rooms Client for Windowsversion=before 5.14.0
Zoom Video Communications, Inc. · Zoom VDI Windows Meeting Clientversion=before 5.14.0
Zoom Video Communications, Inc. · Zoom Client for Meetings for Windowsversion=before 5.14.0

Published CVSS scores

4.1Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1068Exploitation for Privilege Escalation

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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