🛡️ CVE-2023-40548
🟠 CVSS 7.4 — High ✅ No Known Exploit CWE-787 NVD
7.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

Details

Severity HIGH
CVSS Score 7.4
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-787
Public Exploit ✅ No
Source NVD
Published 2024-01-29
Updated 2026-06-08
Modified 2024-11-21
Fix URL N/A

Affected Packages

Software From version Fixed in
fedora
shim

References

Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2241782
Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2241782

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