CVE-2021-31432

Hypervisor memory disclosure via IDE buffer over-read

Published Apr 29, 2021 · Updated Aug 3, 2024

Out-of-bounds read in the IDE virtual device in Parallels Desktop 15.1.5-47309 allows local users to disclose hypervisor memory. The IDE emulation path accepts guest-controlled data without adequate bounds validation and reads beyond the end of an allocated buffer. High-privileged guest code is required; disclosed memory can support a separate chain that escalates into hypervisor code execution.

CVSS severity6.0
Medium
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 the IDE virtual device in Parallels Desktop 15.1.5-47309 allows local users to disclose hypervisor memory. The IDE emulation path accepts guest-controlled data without adequate bounds validation and reads beyond the end of an allocated buffer. High-privileged guest code is required; disclosed memory can support a separate chain that escalates into hypervisor code execution.

The record

CVE
CVE-2021-31432
Published
Apr 29, 2021
Updated
Aug 3, 2024
Vendor
Parallels
Product
Parallels Desktop
Classifications
CWE-125, T1611
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 29, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.1.5-47309

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Parallels · Parallels Desktopversion=15.1.5-47309

Published CVSS scores

6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
6.0Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:P/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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