CVE-2023-31239

Arbitrary code execution via crafted VPR file

Published Jun 19, 2023 · Updated Dec 23, 2024

Stack-based buffer overflow in Fuji Electric V-Server and V-Server Lite 4.0.15.0 and earlier allows attackers to execute code via a VPR file. Public advisories identify overflow during VPR file loading but do not disclose the affected parser or memory-copy operation. Exploitation requires a user to open attacker-supplied content and runs code in that user's application context, enabling data access, modification, or a process crash.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Fuji Electric V-Server and V-Server Lite 4.0.15.0 and earlier allows attackers to execute code via a VPR file. Public advisories identify overflow during VPR file loading but do not disclose the affected parser or memory-copy operation. Exploitation requires a user to open attacker-supplied content and runs code in that user's application context, enabling data access, modification, or a process crash.

The record

CVE
CVE-2023-31239
Published
Jun 19, 2023
Updated
Dec 23, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-125, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8JPCERT/CCCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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