{"cve":"CVE-2023-40548","nvd":{"published":"2024-01-29T15:15:08.893","modified":"2026-06-26T10:16:22.183","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":7.4},"cwes":["CWE-190","CWE-787"],"references":["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"],"products":["fedoraproject:fedora","redhat:shim"],"source":"nvd","synced_at":"2026-10-19T21:44:57.175229480+00:00"},"epss":{"cve":"CVE-2023-40548","score":0.00436,"percentile":0.37871,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}