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Vulnerability record · CVE-2023-40550 · published 29 January 2024

CVE-2023-40550: Redhat shim out-of-bounds read vulnerability

Redhat · Shim

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

5.5 CVSS 3.1 Medium EPSS 0.40% · top 68.7% CWE-125 · Out-of-bounds read
5.5CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
23References
17 Jun 2026Last modified by NVD

Description

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2024:1834
https://access.redhat.com/errata/RHSA-2024:1835
https://access.redhat.com/errata/RHSA-2024:1873
https://access.redhat.com/errata/RHSA-2024:1876
https://access.redhat.com/errata/RHSA-2024:1883
https://access.redhat.com/errata/RHSA-2024:1902
https://access.redhat.com/errata/RHSA-2024:1903
https://access.redhat.com/errata/RHSA-2024:1959
https://access.redhat.com/errata/RHSA-2024:2086
https://access.redhat.com/security/cve/CVE-2023-40550 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2259915 Issue TrackingVendor Advisory
https://access.redhat.com/errata/RHSA-2024:1834
https://access.redhat.com/errata/RHSA-2024:1835
https://access.redhat.com/errata/RHSA-2024:1873
https://access.redhat.com/errata/RHSA-2024:1876
https://access.redhat.com/errata/RHSA-2024:1883
https://access.redhat.com/errata/RHSA-2024:1902
https://access.redhat.com/errata/RHSA-2024:1903
https://access.redhat.com/errata/RHSA-2024:1959
https://access.redhat.com/errata/RHSA-2024:2086
https://access.redhat.com/security/cve/CVE-2023-40550 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2259915 Issue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html

Track CVE-2023-40550 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-40550), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.