CVE-2023-38128Public exploit

Code execution via out-of-bounds Frame write

Published Oct 19, 2023 · Updated Feb 13, 2025

Type confusion in Ichitaro 2023 1.0.1.59372 allows attackers to corrupt memory by opening a maliciously crafted document. The HyperLinkFrame type 0x0807 handler assumes every referenced Frame has the same base type and writes 32 bits at offset 0x754, beyond smaller objects. Opening the file requires user interaction; Talos reports code execution in some cases, while JustSystems confirms only abnormal termination.

CVSS severity7.8
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Ichitaro 2023 1.0.1.59372 allows attackers to corrupt memory by opening a maliciously crafted document. The HyperLinkFrame type 0x0807 handler assumes every referenced Frame has the same base type and writes 32 bits at offset 0x754, beyond smaller objects. Opening the file requires user interaction; Talos reports code execution in some cases, while JustSystems confirms only abnormal termination.

The record

CVE
CVE-2023-38128
Published
Oct 19, 2023
Updated
Feb 13, 2025
Vendor
JustSystems
Product
Ichitaro
Classifications
CWE-843, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=1.0.1.59372

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JustSystems · Ichitaroversion=1.0.1.59372

Published CVSS scores

7.8Cisco TalosCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
1.9JPCERT/CC and IPAAV:L/AC:M/Au:N/C:N/I:N/A:P
3.3JPCERT/CC and IPACVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1204.002Malicious File
T1203Exploitation for Client Execution

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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