VULNERABILITY INTELLIGENCE
CVE-2023-40547
CVSS score8.3 HIGH
EPSS probability5.42%
CISA KEVNot currently listed
Published2024-01-25
Last modified2026-06-26
CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Description
A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.
Weakness classification
- secalert@redhat.com: CWE-787
- nvd@nist.gov: CWE-346