CVE-2021-21987

Name: CVE-2021-21987
Creator: NVD / NIST
Published: 2021-05-24T12:15:07.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2021-21987 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

0.56%

42.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Vmware	Workstation	>= 16.0.0, < 16.1.2
Vmware	Horizon Client	>= 5.0.0, < 5.5.2

References

https://www.vmware.com/security/advisories/VMSA-2021-0009.htmlPatch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-608/Third Party Advisory, VDB Entry
https://www.vmware.com/security/advisories/VMSA-2021-0009.htmlPatch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-608/Third Party Advisory, VDB Entry

Timeline

Published: May 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21987?

How severe is CVE-2021-21987?

CVE-2021-21987 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21987?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21987?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST