CVE-2022-43589Public exploit

System crash via unchecked file context dereference

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 I/O request packet. The handle_ioctl_8314C path dereferences CurrentStackLocation->FileObject->FsContext2 without checking whether the file context is null. The cbfilter20 driver must be running, and IOCTL 0x8314C with a four-byte output buffer and no initialized file context causes a blue-screen crash.

CVSS severity5.5
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 I/O request packet. The handle_ioctl_8314C path dereferences CurrentStackLocation->FileObject->FsContext2 without checking whether the file context is null. The cbfilter20 driver must be running, and IOCTL 0x8314C with a four-byte output buffer and no initialized file context causes a blue-screen crash.

The record

CVE
CVE-2022-43589
Published
Nov 28, 2022
Updated
Apr 15, 2025
Vendor
Callback Technologies
Product
CBFS Filter
Classifications
CWE-476, T1499
Attack vector
local
Privileges
Unavailable

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 privilegesUnavailable in this record.

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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