CVE-2023-38127Public exploit

Application crash via HyperLinkFrame length overflow

Published Oct 19, 2023 · Updated Nov 4, 2025

Integer overflow in the HyperLinkFrame parser in JustSystems Ichitaro 2023 1.0.1.59372 allows attackers to crash it via a crafted document. The type 0x0812 decoder doubles an untrusted 32-bit string length for allocation, wraps the result, then copies the original-length data into the undersized heap buffer. A user must open the file; Talos reports code execution as possible, while the developer confirms only abnormal termination.

CVSS severity7.8
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the HyperLinkFrame parser in JustSystems Ichitaro 2023 1.0.1.59372 allows attackers to crash it via a crafted document. The type 0x0812 decoder doubles an untrusted 32-bit string length for allocation, wraps the result, then copies the original-length data into the undersized heap buffer. A user must open the file; Talos reports code execution as possible, while the developer confirms only abnormal termination.

The record

CVE
CVE-2023-38127
Published
Oct 19, 2023
Updated
Nov 4, 2025
Vendor
JustSystems
Product
Ichitaro
Classifications
CWE-190, 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

1.9JVNAV:L/AC:M/Au:N/C:N/I:N/A:P
3.3JVNCVSS: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-190Integer Overflow or Wraparound
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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