CVE-2021-34418

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

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.

Category

4.0
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.18%
Vendor Advisory zoom.us
Affected: Zoom Video Communications Inc Zoom On-Premise Meeting Connector
Affected: Zoom Video Communications Inc Zoom On-Premise Meeting Connector MMR
Affected: Zoom Video Communications Inc Zoom On-Premise Recording Connector
Affected: Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector
Affected: Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector Load Balancer
Published at:
Updated at:

References

Link Tags
https://explore.zoom.us/en/trust/security/security-bulletin vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-34418?
CVE-2021-34418 has been scored as a medium severity vulnerability.
How to fix CVE-2021-34418?
To fix CVE-2021-34418, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-34418 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-34418 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-34418?
CVE-2021-34418 affects Zoom Video Communications Inc Zoom On-Premise Meeting Connector, Zoom Video Communications Inc Zoom On-Premise Meeting Connector MMR, Zoom Video Communications Inc Zoom On-Premise Recording Connector, Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector, Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector Load Balancer.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.