CVE-2023-34366

Name: CVE-2023-34366
Creator: NVD / NIST
Published: 2023-10-19T18:15:08.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2023-34366 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

A use-after-free vulnerability exists in the Figure stream parsing functionality of Ichitaro 2023 1.0.1.59372. A specially crafted document can cause memory corruption, resulting in arbitrary code execution. Victim would need to open a malicious file to trigger this vulnerability.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.64%

46.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Justsystems	Easy Postcard Max	All versions
Justsystems	Ichitaro 2021	All versions
Justsystems	Ichitaro 2022	All versions
Justsystems	Ichitaro 2023	1.0.1.59372
Justsystems	Ichitaro Government 10	All versions
Justsystems	Ichitaro Government 8	All versions
Justsystems	Ichitaro Government 9	All versions
Justsystems	Ichitaro Pro 3	All versions
Justsystems	Ichitaro Pro 4	All versions
Justsystems	Ichitaro Pro 5	All versions
Justsystems	Just Government 3	All versions
Justsystems	Just Government 4	All versions
Justsystems	Just Government 5	All versions
Justsystems	Just Office 3	All versions
Justsystems	Just Office 4	All versions
Justsystems	Just Office 5	All versions
Justsystems	Just Police 3	All versions
Justsystems	Just Police 4	All versions
Justsystems	Just Police 5	All versions

References

https://jvn.jp/en/jp/JVN28846531/index.htmlThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1758Exploit, Third Party Advisory
https://jvn.jp/en/jp/JVN28846531/index.htmlThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1758Exploit, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1758

Timeline

Published: Oct 19, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-34366?

How severe is CVE-2023-34366?

CVE-2023-34366 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2023-34366?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-34366?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST