How severe is CVE-2020-4491?

CVE-2020-4491 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-2020-4491 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4491?

CVE-2020-4491 affects Ibm Spectrum Scale. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-4491?

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

When was CVE-2020-4491 published?

CVE-2020-4491 was published on 2020-10-20 and last updated on 2026-06-17.

CVE-2020-4491

CVE-2020-4491 is a medium-severity vulnerability in Ibm Spectrum Scale 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.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Spectrum Scale
Published: 2020-10-20
Last modified: 2026-06-17

Description

IBM Spectrum Scale V4.2.0.0 through V4.2.3.22 and V5.0.0.0 through V5.0.5 could allow a local attacker to cause a denial of service by sending a large number of RPC requests to the mmfsd daemon which would cause the service to crash. IBM X-Force ID: 181991.

Frequently asked questions

What is CVE-2020-4491?: IBM Spectrum Scale V4.2.0.0 through V4.2.3.22 and V5.0.0.0 through V5.0.5 could allow a local attacker to cause a denial of service by sending a large number of RPC requests to the mmfsd daemon which would cause the service to crash. IBM X-Force ID: 181991.
How severe is CVE-2020-4491?: CVE-2020-4491 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-2020-4491 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4491?: CVE-2020-4491 affects Ibm Spectrum Scale. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-4491?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4491 published?: CVE-2020-4491 was published on 2020-10-20 and last updated on 2026-06-17.

References

Affected products (1)

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

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