How severe is CVE-2021-38409?

CVE-2021-38409 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38409?

CVE-2021-38409 primarily affects Fujielectric V-server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-38409?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-38409 published?

CVE-2021-38409 was published on 2021-12-20 and last updated on 2026-06-17.

CVE-2021-38409

CVE-2021-38409 is a high-severity vulnerability in Fujielectric V-server with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-824.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-824
Affected product: Fujielectric V-server
Published: 2021-12-20
Last modified: 2026-06-17

Description

Fuji Electric V-Server Lite and Tellus Lite V-Simulator prior to v4.0.12.0 is vulnerable to an access of uninitialized pointer, which may allow an attacker read from or write to unexpected memory locations, leading to a denial-of-service.

Frequently asked questions

What is CVE-2021-38409?: Fuji Electric V-Server Lite and Tellus Lite V-Simulator prior to v4.0.12.0 is vulnerable to an access of uninitialized pointer, which may allow an attacker read from or write to unexpected memory locations, leading to a denial-of-service.
How severe is CVE-2021-38409?: CVE-2021-38409 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38409?: CVE-2021-38409 primarily affects Fujielectric V-server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-38409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-38409 published?: CVE-2021-38409 was published on 2021-12-20 and last updated on 2026-06-17.

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-299-01

Affected products (2)

cpe:2.3:a:fujielectric:v-server:*:*:*:*:lite:*:*:*
cpe:2.3:a:fujielectric:v-simulator:*:*:*:*:lite:*:*:*

More vulnerabilities in Fujielectric V-server

CVE-2019-18240 — Critical (CVSS 9.8): In Fuji Electric V-Server 4.0.6 and prior, several heap-based buffer overflows have been identified, which may allow an…
CVE-2019-3947 — Critical (CVSS 9.8): Fuji Electric V-Server before 6.0.33.0 stores database credentials in project files as plaintext. An attacker that can…
CVE-2023-47586 — High (CVSS 7.8): Multiple heap-based buffer overflow vulnerabilities exist in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0…
CVE-2023-47585 — High (CVSS 7.8): Out-of-bounds read vulnerability exists in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0 and earlier. If a…
CVE-2023-47584 — High (CVSS 7.8): Out-of-bounds write vulnerability exists in V-Server V4.0.18.0 and earlier and V-Server Lite V4.0.18.0 and earlier. If…
CVE-2023-31239 — High (CVSS 7.8): Stack-based buffer overflow vulnerability in V-Server v4.0.15.0 and V-Server Lite v4.0.15.0 and earlier allows an…

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