CVE-2021-43638

Kernel code execution via unchecked IOCTL arithmetic

Published Dec 7, 2021 · Updated Aug 4, 2024

Integer overflow in Amazon WorkSpaces agent below 1.0.1.1537 allows local attackers to execute kernel-mode code or crash the OS. IOCTL handler 0x22001B allocates memory from a caller-controlled size and performs unchecked arithmetic when calculating memmove lengths, allowing a crafted IRP to copy beyond the allocation. Exploitation requires local access to the WorkSpaces Windows client; successful attacks can corrupt memory, execute with kernel privileges, or interrupt the operating system.

CVSS severity8.8
High
EPSS probability0.53%
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 Amazon WorkSpaces agent below 1.0.1.1537 allows local attackers to execute kernel-mode code or crash the OS. IOCTL handler 0x22001B allocates memory from a caller-controlled size and performs unchecked arithmetic when calculating memmove lengths, allowing a crafted IRP to copy beyond the allocation. Exploitation requires local access to the WorkSpaces Windows client; successful attacks can corrupt memory, execute with kernel privileges, or interrupt the operating system.

The record

CVE
CVE-2021-43638
Published
Dec 7, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.2NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

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
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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