CVE-2020-4756

Name: CVE-2020-4756
Creator: NVD / NIST
Published: 2020-10-20T15:15:13.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2020-4756 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.35%

26.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-404

Affected Software

Vendor	Product	Versions
Ibm	Elastic Storage Server	>= 6.0.0.0, <= 6.0.1.0
Ibm	Spectrum Scale	> 4.2.0.0, <= 4.2.3.23
Ibm	Spectrum Scale	> 5.0.0.0, <= 5.0.5.2

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/188599VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6349469Patch, Vendor Advisory
https://www.ibm.com/support/pages/node/6349475Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/188599VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6349469Patch, Vendor Advisory
https://www.ibm.com/support/pages/node/6349475Patch, Vendor Advisory

Timeline

Published: Oct 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-4756?

How severe is CVE-2020-4756?

CVE-2020-4756 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4756?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-4756?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST