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CVE-2020-4788

18
FAUCET Score

CVE-2020-4788 describes a local information disclosure vulnerability affecting IBM Power9 processors running AIX 7.1, 7.2, and VIOS 3.1, as well as products from Fedora and Oracle. This medium-severity vulnerability (CVSS 4.7) allows a low-privileged local attacker, under high attack complexity, to potentially extract sensitive data from the L1 cache. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.0CPE matchmatch criteria
cpe:2.3:a:ibm:vios:3.1.0:*:*:*:*:*:*:*
3.1.1CPE matchmatch criteria
cpe:2.3:a:ibm:vios:3.1.1:*:*:*:*:*:*:*
3.1.2CPE matchmatch criteria
cpe:2.3:a:ibm:vios:3.1.2:*:*:*:*:*:*:*
7.1.0CPE matchmatch criteria
cpe:2.3:o:ibm:aix:7.1.0:*:*:*:*:*:*:*
7.1.5CPE matchmatch criteria
cpe:2.3:o:ibm:aix:7.1.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.1MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.4
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 81st percentile among its peer group of 1,297 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-372.9.1.el8
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt

Vendor Advisories (1)

redhatCVE-2020-4788Moderate

kernel: speculation on incompletely validated data on IBM Power9

Nov 20, 2020

References

exchange.xforce.ibmcloud.com / vulnerabilities/189296
VDB EntryVendor Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT
ibm.com / support/pages/node/6370729
PatchVendor Advisory
oracle.com / security-alerts/cpujul2022.html
PatchThird Party Advisory
openwall.com / lists/oss-security/2020/11/20/3
Mailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2020/11/23/1
Mailing ListThird Party Advisory