CVE-2023-22291Public exploit

Application crash via stack-buffer invalid free

Published Apr 5, 2023 · Updated Aug 2, 2024

Invalid free in the Frame stream parser in JustSystems Ichitaro 2022 1.0.1.57600 allows attackers to crash the application via a crafted JTD document. The member-block reader attaches a stack buffer to a cache object, then frees that pointer when an attacker-controlled 16-bit block length exceeds the buffer capacity. Triggering the crash requires a user to open the malicious document, and the published proof of concept uses a Frame member size greater than 4096 bytes.

CVSS severity7.0
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid free in the Frame stream parser in JustSystems Ichitaro 2022 1.0.1.57600 allows attackers to crash the application via a crafted JTD document. The member-block reader attaches a stack buffer to a cache object, then frees that pointer when an attacker-controlled 16-bit block length exceeds the buffer capacity. Triggering the crash requires a user to open the malicious document, and the published proof of concept uses a Frame member size greater than 4096 bytes.

The record

CVE
CVE-2023-22291
Published
Apr 5, 2023
Updated
Aug 2, 2024
Vendor
JustSystems
Product
Ichitaro
Classifications
CWE-590, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=1.0.1.57600
  2. Affected versionversion=2022 1.0.1.57600

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JustSystems · Ichitaroversion=1.0.1.57600; version=2022 1.0.1.57600

Published CVSS scores

5.1JVNAV:N/AC:H/Au:N/C:P/I:P/A:P
7.0Cisco TalosCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.0JVNCVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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 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-590Free of Memory not on the Heap
T1204.002User Execution: Malicious 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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