CVE-2022-43589: A null pointer dereference vulnerability exists in the handle_ioctl_8314C functionality of Callback technologi

Routine

MEDIUM 5.5DOWNGRADE

CVE-2022-43589 is a medium-severity flaw (CVSS 5.5) affecting cbfs filter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A null pointer dereference vulnerability exists in the handle_ioctl_8314C functionality of Callback technologies CBFS Filter 20.0.8317. A specially crafted I/O request packet (IRP) can lead to denial of service. An attacker can issue an ioctl to trigger this vulnerability.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-476
Published	2022-11-28
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: callback

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-28 11:15 UTCPublished CVE record published
2026-06-17 05:06 UTCUpdated Record last modified

callback cbfs filter DOWNGRADE

Affected: 20.0.8317

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.0.8317

1. Check installed version

apt-cache policy cbfs-filter || rpm -q cbfs-filter || cbfs-filter --version

2. No fixed release: DOWNGRADE to a release before 20.0.8317 (Debian / Ubuntu)

apt-cache madison cbfs-filter sudo apt install cbfs-filter=<VERSION_BEFORE_20.0.8317> sudo apt-mark hold cbfs-filter

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cbfs-filter sudo dnf downgrade cbfs-filter-<VERSION_BEFORE_20.0.8317> sudo dnf versionlock add cbfs-filter

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-43589?

cbfs filter: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-43589 being exploited?

CVE-2022-43589 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-43589 affect?

CVE-2022-43589 affects cbfs filter. Severity is medium (CVSS 5.5). A null pointer dereference vulnerability exists in the handle_ioctl_8314C functionality of Callback technologies CBFS Filter 20.0.8317. A specially crafted I/O request packet (IRP) can lead to denial of service. An attacker can issue an ioc

How urgent is CVE-2022-43589?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2022-43590 MEDIUM 5.5 DOWNGRADE A null pointer dereference vulnerability exists in the handle_ioctl_0x830a0_systembuffer functionality of Call
CVE-2022-43588 MEDIUM 5.5 DOWNGRADE A null pointer dereference vulnerability exists in the handle_ioctl_83150 functionality of Callback technologi

References

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