CVE-2023-39213Network attack vector

Privilege escalation via undisclosed special-element handling

Published Aug 8, 2023 · Updated Oct 10, 2024

Improper special-element neutralization in Zoom Desktop Client for Windows and VDI Client before 5.15.2 allows remote attackers to elevate privileges. Zoom has not published the affected component or the special elements that the clients fail to neutralize before downstream processing. Exploitation is unauthenticated over a network but requires user interaction, and successful exploitation crosses a privilege boundary with confidentiality, integrity, and availability impact.

CVSS severity9.6
Critical
EPSS probability1.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper special-element neutralization in Zoom Desktop Client for Windows and VDI Client before 5.15.2 allows remote attackers to elevate privileges. Zoom has not published the affected component or the special elements that the clients fail to neutralize before downstream processing. Exploitation is unauthenticated over a network but requires user interaction, and successful exploitation crosses a privilege boundary with confidentiality, integrity, and availability impact.

The record

CVE
CVE-2023-39213
Published
Aug 8, 2023
Updated
Oct 10, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-74, CWE-176, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 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

9.8National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6Zoom Video Communications, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-176Improper Handling of Unicode Encoding
T1203Exploitation for Client Execution

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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