CVE-2020-4788

MEDIUMNVD 4.74.7—

4.7

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.

CVSS v3: 4.7
EG Score: 4.7(medium)
EPSS: 41.7%
KEV: Not listed

Published

November 20, 2020

Last Modified

November 21, 2024

References (14)

psirt@ushttp://www.openwall.com/lists/oss-security/2020/11/20/3
psirt@ushttp://www.openwall.com/lists/oss-security/2020/11/23/1
psirt@ushttps://exchange.xforce.ibmcloud.com/vulnerabilities/189296
psirt@ushttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
psirt@ushttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
psirt@ushttps://www.ibm.com/support/pages/node/6370729
psirt@ushttps://www.oracle.com/security-alerts/cpujul2022.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/11/20/3
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/11/23/1
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/189296
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
af854a3a-2127-422b-91ae-364da2661108https://www.ibm.com/support/pages/node/6370729
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujul2022.html

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-image-virtual-lts-xenial (4.4.0.197.203) @ xenial	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-16.04-edge (4.15.0.126.125) @ xenial	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-20.04-edge (5.8.0.31.36) @ groovy	2026-05-23	ubuntu
ubuntu	linux-image-virtual-hwe-20.04 (5.4.0.56.59) @ focal	2026-05-23	ubuntu
ubuntu	linux-image-virtual-lts-xenial (4.4.0.198.204) @ xenial	2026-05-23	ubuntu
redhat	kernel-0:4.18.0-372.9.1.el8	2022-05-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 12:29 UTCOSV refresh
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-4788?

CVE-2020-4788 is a medium vulnerability published on November 20, 2020. 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.

When was CVE-2020-4788 disclosed?

CVE-2020-4788 was first published in the National Vulnerability Database on November 20, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-4788 actively exploited?

CVE-2020-4788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 41.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-4788?

CVE-2020-4788 has a CVSS v3 base score of 4.7 (NVD).

How do I remediate CVE-2020-4788?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-4788, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-4788

📅 Published

🔄 Last Modified

🔗 References (14)

Patch Availability(6)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-4788?

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References (14)

Frequently asked(5)

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