What is CVE-2021-34419?

CVE-2021-34419 is a low-severity vulnerability in Zoom Client For Meetings, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 3.7/10. Published 2021-11-11.

How severe is CVE-2021-34419?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Zoom Client For Meetings

CVE-2021-34419

In the Zoom Client for Meetings for Ubuntu Linux before version 5.1.0, there is an HTML injection flaw when sending a remote control request to a user in the process of in-meeting screen sharing. This could allow meeting participants to be targeted for social engineering attacks.

Published 2021-11-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Zoom Client For Meetings
Zoom Video Communications Inc Client For Meetings Ubuntu Linux — versions unspecified

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

explore.zoom.us/en/trust/security/security-bulletin (Vendor Advisory)

Frequently asked questions

What is CVE-2021-34419?: CVE-2021-34419 is a low-severity vulnerability in Zoom Client For Meetings, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 3.7/10. Published 2021-11-11.
How severe is CVE-2021-34419?: Low severity. CVSS v3 base score is 3.7 out of 10.