CVE-2021-34418

mediumpriority · track · 21EPSS 0.006 · 50 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.63% (50th) EPSS

CVSS 5 · medium

Is it mine?

15 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

cvss

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

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.14mediumAV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.14mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.14mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · security@zoom.usexploitability 2.5 · impact 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-476USprimaryCWE-476US

affected products (15)

Products and version ranges known to be affected.

Zoom Video Communications Inc Zoom On-Premise Meeting Connectorunspecified → 4.6.239.20200613enisa_euvdEU
Zoom Video Communications Inc Zoom On-Premise Meeting Connector MMRunspecified → 4.6.239.20200613enisa_euvdEU
Zoom Video Communications Inc Zoom On-Premise Recording Connectorunspecified → 3.8.42.20200905enisa_euvdEU
Zoom Video Communications Inc Zoom On-Premise Virtual Room Connectorunspecified → 4.4.6344.20200612enisa_euvdEU
Zoom Video Communications Inc Zoom On-Premise Virtual Room Connector Load Balancerunspecified → 2.5.5492.20200616enisa_euvdEU
Zoom Video Communications, Inc. Zoom On-Premise Meeting Connector≤ 4.6.239.20200613fstec_bduRU
Zoom Video Communications, Inc. Zoom On-Premise Meeting Connector MMR≤ 4.6.239.20200613fstec_bduRU
Zoom Video Communications, Inc. Zoom On-Premise Recording Connector≤ 3.8.42.20200905fstec_bduRU
Zoom Video Communications, Inc. Zoom On-Premise Virtual Room Connector≤ 4.4.6344.20200612fstec_bduRU
Zoom Video Communications, Inc. Zoom On-Premise Virtual Room Connector Load Balancer≤ 2.5.5492.20200616fstec_bduRU
zoom zoom on-premise meeting connector controller< 4.6.239.20200613nvdUScpe:2.3:a:zoom:zoom_on-premise_meeting_connector_controller:*:*:*:*:*:*:*:*
zoom zoom on-premise meeting connector mmr< 4.6.239.20200613nvdUScpe:2.3:a:zoom:zoom_on-premise_meeting_connector_mmr:*:*:*:*:*:*:*:*
zoom zoom on-premise recording connector< 3.8.42.20200905nvdUScpe:2.3:a:zoom:zoom_on-premise_recording_connector:*:*:*:*:*:*:*:*
zoom zoom on-premise virtual room connector< 4.4.6344.20200612nvdUScpe:2.3:a:zoom:zoom_on-premise_virtual_room_connector:*:*:*:*:*:*:*:*
zoom zoom on-premise virtual room connector load balancer< 2.5.5492.20200616nvdUScpe:2.3:a:zoom:zoom_on-premise_virtual_room_connector_load_balancer:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-11-11modified 2026-06-17

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+8782 more

references (5)

External citations — patches, advisories, analysis.

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