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No exploitation reportedFix available

CVE-2021-38421

No exploitation reported by the sources we read.

  • Published2021-12-20
  • Fixed in4.0.12.0
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Fuji Electric V-Server Lite and Tellus Lite V-Simulator prior to v4.0.12.0 is vulnerable to an out-of-bounds read, which may allow an attacker to read sensitive information from other memory locations or cause a crash.

Timeline

dates in UTC
  1. 2021-12-2021:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-38421?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-38421?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Fujielectric v-server
BranchAffectedFixed in
4.0< 4.0.12.04.0.12.0
Fujielectric v-simulator
BranchAffectedFixed in
4.0< 4.0.12.04.0.12.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-21-299-01 CISA2 known affected

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

    V-Server Lite: Versions prior to v4.0.12.0 · Tellus Lite V-Simulator: Versions prior to v4.0.12.0

Full record on NVD

Fix

  1. Update Fujielectric v-server to 4.0.12.0
  2. Mitigation from the vendor CISA ICSA-21-299-01 · 2 productsTELLUS Lite software: Version 4.0.12.0 Disk1
  3. Mitigation from the vendor CISA ICSA-21-299-01 · 2 productsTELLUS Lite software: Version 4.0.12.0 Disk2
  4. Mitigation from the vendor CISA ICSA-21-299-01 · 2 productsV-Server Lite software: Version 4.0.12.0 Disk1
  5. Mitigation from the vendor CISA ICSA-21-299-01 · 2 productsV-Server Lite software: Version 4.0.12.0 Disk2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.17.8read 2026-10-23
  • NVDCVSS 3.17.1read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-125read 2026-10-23
  • FIRST EPSSEPSS score0.8 %2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Published
2021-12-20
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-38421?

Fuji Electric V-Server Lite and Tellus Lite V-Simulator prior to v4.0.12.0 is vulnerable to an out-of-bounds read, which may allow an attacker to read sensitive information from other memory locations or cause a crash.

Is CVE-2021-38421 actively exploited?

Active exploitation of CVE-2021-38421 has not been confirmed. Its EPSS score was 0.8% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-38421?

CVE-2021-38421 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

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