CVE-2020-4788

Name: CVE-2020-4788
Creator: NVD / NIST
Published: 2020-11-20T04:15:11.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2020-4788 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.7/10

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

EPSS Probability

0.39%

30.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Ibm	Vios	3.1.0
Ibm	Vios	3.1.1
Ibm	Vios	3.1.2
Ibm	Aix	7.1.0
Ibm	Aix	7.1.5
Ibm	Aix	7.2.0
Ibm	Aix	7.2.3
Ibm	Aix	7.2.4
Ibm	Aix	7.2.5
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Oracle	Communications Cloud Native Core Binding Support Function	22.1.3
Oracle	Communications Cloud Native Core Network Exposure Function	22.1.1
Oracle	Communications Cloud Native Core Policy	22.2.0

References

http://www.openwall.com/lists/oss-security/2020/11/20/3Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/23/1Mailing List, Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/189296VDB Entry, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
https://www.ibm.com/support/pages/node/6370729Patch, Vendor Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/20/3Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/23/1Mailing List, Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/189296VDB Entry, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
https://www.ibm.com/support/pages/node/6370729Patch, Vendor Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory

Timeline

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

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 score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4788?

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-2020-4788?

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

Scan your code now

Source: NVD / NIST