How severe is CVE-2021-38420?

CVE-2021-38420 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38420?

CVE-2021-38420 affects Deltaww Dialink. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38420?

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-2021-38420 published?

CVE-2021-38420 was published on 2021-11-03 and last updated on 2026-06-17.

CVE-2021-38420

CVE-2021-38420 is a high-severity vulnerability in Deltaww Dialink 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-276.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Deltaww Dialink
Published: 2021-11-03
Last modified: 2026-06-17

Description

Delta Electronics DIALink versions 1.2.4.0 and prior default permissions give extensive permissions to low-privileged user accounts, which may allow an attacker to modify the installation directory and upload malicious files.

Frequently asked questions

What is CVE-2021-38420?: Delta Electronics DIALink versions 1.2.4.0 and prior default permissions give extensive permissions to low-privileged user accounts, which may allow an attacker to modify the installation directory and upload malicious files.
How severe is CVE-2021-38420?: CVE-2021-38420 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38420?: CVE-2021-38420 affects Deltaww Dialink. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38420?: 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-2021-38420 published?: CVE-2021-38420 was published on 2021-11-03 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-294-02

Affected products (1)

cpe:2.3:a:deltaww:dialink:*:*:*:*:*:*:*:*

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