CVE-2022-43664Public exploit

Code execution via protected-document attribute double free

Published Apr 5, 2023 · Updated Feb 10, 2025

Use-after-free in protected-document processing in JustSystems Ichitaro 2022 1.0.1.57600 allows attackers to execute arbitrary code. The JSVDA.dll attribute-arena lookup leaves an identifier zeroed, returns an allocated result pointer on error, and releases it before JSTARO25.OCX releases it again. Exploitation requires a user to open a crafted JTD document; successful memory corruption runs attacker-controlled code in that user's process.

CVSS severity7.8
High
EPSS probability0.53%
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 protected-document processing in JustSystems Ichitaro 2022 1.0.1.57600 allows attackers to execute arbitrary code. The JSVDA.dll attribute-arena lookup leaves an identifier zeroed, returns an allocated result pointer on error, and releases it before JSTARO25.OCX releases it again. Exploitation requires a user to open a crafted JTD document; successful memory corruption runs attacker-controlled code in that user's process.

The record

CVE
CVE-2022-43664
Published
Apr 5, 2023
Updated
Feb 10, 2025
Vendor
JustSystems
Product
Ichitaro
Classifications
CWE-416, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 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=2022 1.0.1.57600

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JustSystems · Ichitaroversion=2022 1.0.1.57600

Published CVSS scores

7.8JVNCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8JVNAV:N/AC:M/Au:N/C:P/I:P/A:P
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
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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