Skip to content
Fencer Vulns
high 7.8

CVE-2021-22637 json

Multiple stack-based buffer overflow issues have been identified in the way the application processes project files, allowing an attacker t…

published 2021-01-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9773

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

Multiple stack-based buffer overflow issues have been identified in the way the application processes project files, allowing an attacker to craft a special project file that may allow arbitrary code execution on the Tellus Lite V-Simulator and V-Server Lite (versions prior to 4.0.10.0).

Patch / fix

  • fujielectric v-server 4.0.10.0
  • fujielectric v-simulator 4.0.10.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-026-01 updated cvss 7.8

Fuji Electric Tellus Lite V-Simulator and V-Server Lite

  • Fuji Electric Tellus Lite V-Simulator < 4.0.10.0 Fuji Electric V-Server Lite < 4.0.10.0
    affected: mitigation “Fuji Electric recommends updating to the current version v4.0.10.0. Both disks are required for updating. Login is required to download the files.” felib.fujielectric.co.jp

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.23% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a Tellus Lite V-Simulator and V-Server Lite

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.