CVE-2021-21988

TPView memory disclosure via JPEG2000 parser over-read

Published May 24, 2021 · Updated Aug 3, 2024

Out-of-bounds read in VMware Workstation 16.x and Horizon Client for Windows 5.x allows attackers to disclose TPView process memory. The Cortado ThinPrint JPEG2000 parser reads beyond a buffer boundary while TPView processes virtual-printing data. Exploitation requires virtual printing; it is disabled by default in Workstation and enabled by default in Horizon Client for Windows, and no write or service-interruption impact is reported.

CVSS severity3.2
Low
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in VMware Workstation 16.x and Horizon Client for Windows 5.x allows attackers to disclose TPView process memory. The Cortado ThinPrint JPEG2000 parser reads beyond a buffer boundary while TPView processes virtual-printing data. Exploitation requires virtual printing; it is disabled by default in Workstation and enabled by default in Horizon Client for Windows, and no write or service-interruption impact is reported.

The record

CVE
CVE-2021-21988
Published
May 24, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.2VMwareCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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