CVE-2023-34366Public exploit

Code execution via dangling Figure object reference

Published Oct 19, 2023 · Updated Nov 4, 2025

Use-after-free in the Figure stream parser in JustSystems Ichitaro 2023 1.0.1.59372 allows attackers to execute code via a crafted JTD file. The parser stores a Figure object in an array before decoding, frees it after a block error, then dereferences and writes through the dangling array entry. A user must open the malicious file; JustSystems reports only demonstrated abnormal termination, while Talos reports code execution.

CVSS severity7.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Figure stream parser in JustSystems Ichitaro 2023 1.0.1.59372 allows attackers to execute code via a crafted JTD file. The parser stores a Figure object in an array before decoding, frees it after a block error, then dereferences and writes through the dangling array entry. A user must open the malicious file; JustSystems reports only demonstrated abnormal termination, while Talos reports code execution.

The record

CVE
CVE-2023-34366
Published
Oct 19, 2023
Updated
Nov 4, 2025
Vendor
JustSystems
Product
Ichitaro
Classifications
CWE-416, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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

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
7.8Cisco TalosCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution
T1204.002Malicious File

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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