CVE-2022-43664: A use-after-free vulnerability exists within the way Ichitaro Word Processor 2022, version 1.0.1.57600, proces

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HIGH 7.8DOWNGRADE

CVE-2022-43664 is a high-severity flaw (CVSS 7.8) affecting ichitaro 2022. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A use-after-free vulnerability exists within the way Ichitaro Word Processor 2022, version 1.0.1.57600, processes protected documents. A specially crafted document can trigger reuse of freed memory, which can lead to further memory corruption and potentially result in arbitrary code execution. An attacker can provide a malicious document to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-416
Published	2023-04-05
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: justsystems

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

Am I affected?

Timeline

2023-04-05 16:15 UTCPublished CVE record published
2026-06-17 05:07 UTCUpdated Record last modified

justsystems ichitaro 2022 DOWNGRADE

Affected: 1.0.1.57600

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.1.57600

1. Check installed version

apt-cache policy ichitaro-2022 || rpm -q ichitaro-2022 || ichitaro-2022 --version

2. No fixed release: DOWNGRADE to a release before 1.0.1.57600 (Debian / Ubuntu)

apt-cache madison ichitaro-2022 sudo apt install ichitaro-2022=<VERSION_BEFORE_1.0.1.57600> sudo apt-mark hold ichitaro-2022

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

dnf --showduplicates list ichitaro-2022 sudo dnf downgrade ichitaro-2022-<VERSION_BEFORE_1.0.1.57600> sudo dnf versionlock add ichitaro-2022

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-2022-43664?

ichitaro 2022: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-43664 being exploited?

CVE-2022-43664 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-2022-43664 affect?

CVE-2022-43664 affects ichitaro 2022. Severity is high (CVSS 7.8). A use-after-free vulnerability exists within the way Ichitaro Word Processor 2022, version 1.0.1.57600, processes protected documents. A specially crafted document can trigger reuse of freed memory, which can lead to further memory corrupti

How urgent is CVE-2022-43664?

Priority 43/100. High severity; Public exploit reference

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CVE-2023-38127 HIGH 7.8 MITIGATE MITIGATE An integer overflow exists in the "HyperLinkFrame" stream parser of Ichitaro 2023 1.0.1.59372
CVE-2023-35126 HIGH 7.8 MITIGATE MITIGATE An out-of-bounds write vulnerability exists within the parsers for both the "DocumentViewStyles" and "Document
CVE-2023-34366 HIGH 7.8 MITIGATE MITIGATE A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372
CVE-2023-22660 HIGH 7.0 DOWNGRADE A heap-based buffer overflow vulnerability exists in the way Ichitaro version 2022 1.0.1.57600 processes certa

References

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