How severe is CVE-2020-5684?

CVE-2020-5684 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-5684 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5684?

CVE-2020-5684 affects Nec Ism Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5684?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-5684 published?

CVE-2020-5684 was published on 2020-12-24 and last updated on 2026-06-17.

CVE-2020-5684

CVE-2020-5684 is a medium-severity vulnerability in Nec Ism Server with a CVSS 3.x base score of 4.8. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 5.8
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Nec Ism Server
Published: 2020-12-24
Last modified: 2026-06-17

Description

iSM client versions from V5.1 prior to V12.1 running on NEC Storage Manager or NEC Storage Manager Express does not verify a server certificate properly, which allows a man-in-the-middle attacker to eavesdrop on an encrypted communication or alter the communication via a crafted certificate.

Frequently asked questions

What is CVE-2020-5684?: iSM client versions from V5.1 prior to V12.1 running on NEC Storage Manager or NEC Storage Manager Express does not verify a server certificate properly, which allows a man-in-the-middle attacker to eavesdrop on an encrypted communication or alter the communication via a crafted certificate.
How severe is CVE-2020-5684?: CVE-2020-5684 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-5684 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5684?: CVE-2020-5684 affects Nec Ism Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5684?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-5684 published?: CVE-2020-5684 was published on 2020-12-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nec:ism_server:*:*:*:*:*:*:*:*

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