CVE-2023-40547
Published: Jan 25, 2024
Modified: Nov 20, 2025
CVSS v3.1
8.3
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.
| Vendor | Product | Versions |
|---|---|---|
Red Hat | Red Hat Enterprise Linux 7 | unaffected 0:15.8-3.el7 - < * |
Red Hat | Red Hat Enterprise Linux 7 | unaffected 0:15.8-1.el7 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:15.8-4.el8_9 - < * |
Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | unaffected 0:15.8-2.el8_2 - < * |
Red Hat | Red Hat Enterprise Linux 8.2 Telecommunications Update Service | unaffected 0:15.8-2.el8_2 - < * |
Red Hat | Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | unaffected 0:15.8-2.el8_2 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:15.8-2.el8_4 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Telecommunications Update Service | unaffected 0:15.8-2.el8_4 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | unaffected 0:15.8-2.el8_4 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | unaffected 0:15.8-2.el8_6 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | unaffected 0:15.8-2.el8 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | unaffected 0:15.8-2.el8 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:15.8-4.el9_3 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | unaffected 0:15.8-3.el9 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | unaffected 0:15.8-2.el9 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | unaffected 0:15.8-2.el9 - < * |
Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | unaffected 0:15.8-3.el9_2 - < * |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
Security Training
Train your team to recognize and prevent security threats with our comprehensive security awareness program.
Start TrainingVulnerability Scanning
Discover vulnerabilities in your applications and infrastructure before attackers do.
Scan Now