CVE-2022-43588Public exploit

Windows crash via unchecked IOCTL file object

Published Nov 28, 2022 · Updated Apr 15, 2025

Null pointer dereference in Callback Technologies CBFS Filter 20.0.8317 allows local users to crash Windows via a crafted IRP. The handle_ioctl_83150 routine accepts IOCTL 0x83150 without verifying that CurrentStackLocation->FileObject is non-null before reading its FsContext2 member. A process able to open the driver's device interface can send the request directly, triggering an immediate system bugcheck and service interruption.

CVSS severity6.2
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Callback Technologies CBFS Filter 20.0.8317 allows local users to crash Windows via a crafted IRP. The handle_ioctl_83150 routine accepts IOCTL 0x83150 without verifying that CurrentStackLocation->FileObject is non-null before reading its FsContext2 member. A process able to open the driver's device interface can send the request directly, triggering an immediate system bugcheck and service interruption.

The record

CVE
CVE-2022-43588
Published
Nov 28, 2022
Updated
Apr 15, 2025
Vendor
Callback Technologies
Product
CBFS Filter
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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=20.0.8317

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Callback Technologies · CBFS Filterversion=20.0.8317

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.2Cisco TalosCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

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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