CVE-2021-34415

Name: CVE-2021-34415
Creator: NVD / NIST
Published: 2021-09-27T14:15:08.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-34415 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The Zone Controller service in the Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 does not verify the cnt field sent in incoming network packets, which leads to exhaustion of resources and system crash.. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

The Zone Controller service in the Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 does not verify the cnt field sent in incoming network packets, which leads to exhaustion of resources and system crash.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.95%

56.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Zoom	Meeting Connector	< 4.6.358.20210205

References

https://explore.zoom.us/en/trust/security/security-bulletin/Vendor Advisory
https://explore.zoom.us/en/trust/security/security-bulletin/Vendor Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34415?

How severe is CVE-2021-34415?

CVE-2021-34415 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34415?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34415?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST