How severe is CVE-2020-4788?

CVE-2020-4788 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-4788 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4788?

CVE-2020-4788 primarily affects Ibm Vios. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4788?

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

When was CVE-2020-4788 published?

CVE-2020-4788 was published on 2020-11-20 and last updated on 2026-06-17.

CVE-2020-4788

CVE-2020-4788 is a medium-severity vulnerability in Ibm Vios with a CVSS 3.x base score of 4.7. 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 4.7)
CVSS v2: 1.9
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Vios
Published: 2020-11-20
Last modified: 2026-06-17

Description

IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.

Frequently asked questions

What is CVE-2020-4788?: IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.
How severe is CVE-2020-4788?: CVE-2020-4788 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-4788 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4788?: CVE-2020-4788 primarily affects Ibm Vios. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4788?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4788 published?: CVE-2020-4788 was published on 2020-11-20 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:a:ibm:vios:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:vios:3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:vios:3.1.2:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.1.0:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.1.5:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.2.0:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.2.3:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.2.4:*:*:*:*:*:*:*
cpe:2.3:o:ibm:aix:7.2.5:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:*

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