What is CVE-2024-39821?

CVE-2024-39821 is a medium-severity vulnerability in Zoom Rooms, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.6/10. Published 2024-07-15.

How severe is CVE-2024-39821?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Vulnerability in Zoom Rooms

CVE-2024-39821

Race condition in the installer for Zoom Workplace App for Windows and Zoom Rooms App for Windows may allow an authenticated user to conduct a denial of service via local access.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2024-07-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (2.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Zoom Rooms
Zoom Workplace Desktop
Zoom Communications, Inc Workplace App For Windows And Rooms — versions see references

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

www.zoom.com/en/trust/security-bulletin/zsb-24028 (Vendor Advisory)

Frequently asked questions

What is CVE-2024-39821?: CVE-2024-39821 is a medium-severity vulnerability in Zoom Rooms, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.6/10. Published 2024-07-15.
How severe is CVE-2024-39821?: Medium severity. CVSS v3 base score is 6.6 out of 10.