CVE-2020-4788

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.38% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 31.0% of scored records. A rank, not a probability.

NVD base score

4.7 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-11-20 03:45Z5 YR AGO

Last updated

2024-09-16 19:05Z1 YR AGO

Reserved

2019-12-30

Assigning CNA

ibm

Record state

PUBLISHED

Severity

Medium (CVSS 5.1)

CNA CVSS vector

CVSS:3.0/PR:N/C:H/AV:L/AC:H/S:U/A:N/I:N/UI:N/E:U/RC:C/RL:O

Weaknesses

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass

Data version

5.1

Document digest

9e99307eaa978a7bb7503328a57b2eb0449b2c1175ed2ee0b582f645966e9e79

• www.ibm.comhttps://www.ibm.com/support/pages/node/6370729x_refsource_CONFIRM
• exchange.xforce.ibmcloud.comibm-i-cve20204788-info-disc (189296)https://exchange.xforce.ibmcloud.com/vulnerabilities/189296vdb-entryx_refsource_XF
• www.openwall.com[oss-security] 20201120 CVE-2020-4788: Speculation on incompletely validated data on IBM Power9http://www.openwall.com/lists/oss-security/2020/11/20/3mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20201123 Re: CVE-2020-4788: Speculation on incompletely validated data on IBM Power9http://www.openwall.com/lists/oss-security/2020/11/23/1mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2020-4700a73bd5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2020-8c15928d23https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/vendor-advisoryx_refsource_FEDORA
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.htmlx_refsource_MISC