What is CVE-2023-31239?

CVE-2023-31239 is a high-severity vulnerability in Fujielectric V-Server, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2023-06-19.

How severe is CVE-2023-31239?

High severity. CVSS v3 base score is 7.8 out of 10.

Out-of-bounds Read in Fujielectric V-Server

CVE-2023-31239

Stack-based buffer overflow vulnerability in V-Server v4.0.15.0 and V-Server Lite v4.0.15.0 and earlier allows an attacker to execute arbitrary code by having user open a specially crafted VPR file.

Vulnerability class: Buffer Overflow

Published 2023-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (16.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Fujielectric V-Server — versions 4.0.15.0
Fuji Electric Co., Ltd. And Hakko Electronics V-Server Lite — versions v4.0.15.0 and earlier

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php (Release Notes)
jvn.jp/en/vu/JVNVU98818508/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-31239?: CVE-2023-31239 is a high-severity vulnerability in Fujielectric V-Server, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2023-06-19.
How severe is CVE-2023-31239?: High severity. CVSS v3 base score is 7.8 out of 10.