CVE-2021-21987

lowpriority · track · 26EPSS 0.006 · 46 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.56% (46th) EPSS

CVSS 2.1 · low

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

VMware Workstation (16.x prior to 16.1.2) and Horizon Client for Windows (5.x prior to 5.5.2) contain out-of-bounds read vulnerability in the Cortado ThinPrint component (TTC Parser). A malicious actor with access to a virtual machine or remote desktop may be able to exploit these issues leading to information disclosure from the TPView process running on the system where Workstation or Horizon Client for Windows is installed.

cvss

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

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–6.5

v2.02.1lowAV:L/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2 · impact 4

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

v3.16mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USprimaryCWE-125US

affected products (7)

Products and version ranges known to be affected.

n/a VMware Workstation Pro / Player (Workstation), VMware Horizon Client for Windows≤ VMware Workstation (16.x prior to 16.1.2) and Horizon Client for Windows (5.x prior to 5.5.2)enisa_euvdEU
Broadcom Inc. VMWare Workstation≤ 16.1.1fstec_bduRU
Broadcom Inc. VMWare Workstation≤ 16.1.0fstec_bduRU
Broadcom Inc. VMWare Workstation≤ 16.0fstec_bduRU
Omnissa Omnissa Horizon Client5.0.0 → 5.5.2fstec_bduRU
vmware horizon client5.0.0 → 5.5.2nvdUScpe:2.3:a:vmware:horizon_client:*:*:*:*:*:*:*:*
vmware workstation16.0.0 → 16.1.2nvdUScpe:2.3:a:vmware:workstation:*:*:*:*:*:*:*:*

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 2021-05-24modified 2026-06-17

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+11867 more

references (9)

External citations — patches, advisories, analysis.

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