How severe is CVE-2020-4756?

CVE-2020-4756 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-4756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4756?

CVE-2020-4756 primarily affects Ibm Elastic Storage 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-2020-4756?

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

When was CVE-2020-4756 published?

CVE-2020-4756 was published on 2020-10-20 and last updated on 2026-06-17.

CVE-2020-4756

CVE-2020-4756 is a medium-severity vulnerability in Ibm Elastic Storage Server with a CVSS 3.x base score of 5.5. 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-404.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.9
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-404
Affected product: Ibm Elastic Storage Server
Published: 2020-10-20
Last modified: 2026-06-17

Description

IBM Spectrum Scale V4.2.0.0 through V4.2.3.23 and V5.0.0.0 through V5.0.5.2 as well as IBM Elastic Storage System 6.0.0 through 6.0.1.0 could allow a local attacker to invoke a subset of ioctls on the device with invalid arguments that could crash the keneral and cause a denial of service. IBM X-Force ID: 188599.

Frequently asked questions

What is CVE-2020-4756?: IBM Spectrum Scale V4.2.0.0 through V4.2.3.23 and V5.0.0.0 through V5.0.5.2 as well as IBM Elastic Storage System 6.0.0 through 6.0.1.0 could allow a local attacker to invoke a subset of ioctls on the device with invalid arguments that could crash the keneral and cause a denial of service. IBM X-Force ID: 188599.
How severe is CVE-2020-4756?: CVE-2020-4756 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-4756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4756?: CVE-2020-4756 primarily affects Ibm Elastic Storage 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-2020-4756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4756 published?: CVE-2020-4756 was published on 2020-10-20 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:ibm:elastic_storage_server:*:*:*:*:*:*:*:*
cpe:2.3:a:ibm:spectrum_scale:*:*:*:*:*:*:*:*

More vulnerabilities in Ibm Elastic Storage Server

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CVE-2020-4382 — Medium (CVSS 5.5): IBM Spectrum Scale for IBM Elastic Storage Server 5.3.0 through 5.3.5 could allow an authenticated user to cause a…

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