CVE-2021-34413

mediumpriority · track · 30EPSS 0.006 · 48 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.58% (48th) EPSS

CVSS 6 · medium

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

All versions of the Zoom Plugin for Microsoft Outlook for MacOS before 5.3.52553.0918 contain a Time-of-check Time-of-use (TOC/TOU) vulnerability during the plugin installation process. This could allow a standard user to write their own malicious application to the plugin directory, allowing the malicious application to execute in a privileged context.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6–7.5

v2.06mediumAV:N/AC:M/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 6.8 · impact 6.4

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.6 · impact 5.9

v3.16.9mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-367USprimary

affected products (2)

Products and version ranges known to be affected.

n/a Zoom Plugin for Microsoft Outlook for MacOS≤ All versions before 5.3.52553.0918enisa_euvdEU
zoom zoom plugin for microsoft outlook< 5.3.52553.0918nvdUScpe:2.3:a:zoom:zoom_plugin_for_microsoft_outlook:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-09-27modified 2026-06-17

related (1,062)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2025-38352US	—OT critical	1.36% (72nd)	KEV	2025-07-22
In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autor…
CVE-2025-22224US	high8.2OT critical	1.56% (75th)	KEV	2025-03-04
VMware ESXi, and Workstation contain a TOCTOU (Time-of-Check Time-of-Use) vulnerability that leads to an out-of-bounds write. A malicious actor with local administrative privileges…
CVE-2024-30088US	—OT critical	68.2% (99th)	KEV	2024-06-11
Windows Kernel Elevation of Privilege Vulnerability
CVE-2022-48618US	high7.0OT critical	0.49% (42nd)	KEV	2024-01-09
The issue was addressed with improved checks. This issue is fixed in macOS Ventura 13.1, watchOS 9.2, iOS 16.2 and iPadOS 16.2, tvOS 16.2. An attacker with arbitrary read and write…
CVE-2023-35311US	—OT critical	15.5% (97th)	KEV	2023-07-11
Microsoft Outlook Security Feature Bypass Vulnerability

+1057 more

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan