CVE-2021-34416Network attack vector

Authenticated command injection via network configuration updates

Published Sep 27, 2021 · Updated Aug 4, 2024

Command injection in Zoom on-premise connectors allows remote authenticated users to execute commands through the network settings portal. The network-address settings handler accepts unvalidated configuration-update values and passes them into command execution on the appliance image. Web portal administrator access is required; affected builds are Meeting Connector and MMR before 4.6.360.20210325, Recording Connector before 3.8.44.20210326, Virtual Room Connector before 4.4.6752.20210326, and its Load Balancer before 2.5.5495.20210326.

CVSS severity9.8
Critical
EPSS probability1.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Zoom on-premise connectors allows remote authenticated users to execute commands through the network settings portal. The network-address settings handler accepts unvalidated configuration-update values and passes them into command execution on the appliance image. Web portal administrator access is required; affected builds are Meeting Connector and MMR before 4.6.360.20210325, Recording Connector before 3.8.44.20210326, Virtual Room Connector before 4.4.6752.20210326, and its Load Balancer before 2.5.5495.20210326.

The record

CVE
CVE-2021-34416
Published
Sep 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1059Command and Scripting Interpreter

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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