CVE-2021-31425

Guest kernel code execution via integer overflow

Published Apr 29, 2021 · Updated Aug 3, 2024

Integer overflow in Parallels Tools in Parallels Desktop 16.1.2-49151 allows local users to execute arbitrary guest-kernel code. Parallels Tools fails to validate user-supplied data before allocating a buffer, allowing an integer overflow to produce an undersized allocation. Exploitation requires low-privileged code execution inside a guest system and yields arbitrary code execution in that guest's kernel context.

CVSS severity8.8
High
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

Integer overflow in Parallels Tools in Parallels Desktop 16.1.2-49151 allows local users to execute arbitrary guest-kernel code. Parallels Tools fails to validate user-supplied data before allocating a buffer, allowing an integer overflow to produce an undersized allocation. Exploitation requires low-privileged code execution inside a guest system and yields arbitrary code execution in that guest's kernel context.

The record

CVE
CVE-2021-31425
Published
Apr 29, 2021
Updated
Aug 3, 2024
Vendor
Parallels
Product
Parallels Desktop
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

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=16.1.2-49151

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Parallels · Parallels Desktopversion=16.1.2-49151

Published CVSS scores

8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

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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