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CVE-2021-34418

Pre-auth Null pointer crash in on-premise web console

MEDIUM
5.3
CVSS Score
Published: November 11, 2021 at 10:59 PM UTC
Updated: June 17, 2026 at 03:55 AM UTC
10 products affected across 2 vendorsOn-Premise Meeting Connector MMROn-Premise Meeting Connector ControllerOn-Premise Recording Connector

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.6%

Description

The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

On-Premise Meeting Connector Controller· Zoom
95%
v < 4.6.239.20200613
Affected range stops below 4.6.239.20200613, so it looks safe — our inference, not a vendor statement
On-Premise Meeting Connector MMR· Zoom
95%
v < 4.6.239.20200613
Affected range stops below 4.6.239.20200613, so it looks safe — our inference, not a vendor statement
On-Premise Recording Connector· Zoom
95%
v < 3.8.42.20200905
Affected range stops below 3.8.42.20200905, so it looks safe — our inference, not a vendor statement
On-Premise Virtual Room Connector· Zoom
95%
v < 4.4.6344.20200612
Affected range stops below 4.4.6344.20200612, so it looks safe — our inference, not a vendor statement
On-Premise Virtual Room Connector Load Balancer· Zoom
95%
v < 2.5.5492.20200616
Affected range stops below 2.5.5492.20200616, so it looks safe — our inference, not a vendor statement
On-Premise Meeting Connector· Zoom Video Communications
60%
v < 4.6.239.20200613
Affected range stops below 4.6.239.20200613, so it looks safe — our inference, not a vendor statement
Zoom On-Premise Meeting Connector MMR· Zoom Video Communications
60%
v < 4.6.239.20200613
Affected range stops below 4.6.239.20200613, so it looks safe — our inference, not a vendor statement
Zoom On-Premise Recording Connector· Zoom Video Communications
60%
v < 3.8.42.20200905
Affected range stops below 3.8.42.20200905, so it looks safe — our inference, not a vendor statement
Zoom On-Premise Virtual Room Connector· Zoom Video Communications
60%
v < 4.4.6344.20200612
Affected range stops below 4.4.6344.20200612, so it looks safe — our inference, not a vendor statement
Zoom On-Premise Virtual Room Connector Load Balancer· Zoom Video Communications
60%
v < 2.5.5492.20200616
Affected range stops below 2.5.5492.20200616, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://explore.zoom.us/en/trust/security/security-bulletin

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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