High severity8.3NVD Advisory· Published Jan 25, 2024· Updated Jun 26, 2026
CVE-2023-40547
CVE-2023-40547
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
39- Red Hat/Red Hat Enterprise Linux 9.0 Extended Update Supportv5cpe:/a:redhat:rhel_eus:9.0::appstreamRange: 0:15.8-2.el9
cpe:/o:redhat:enterprise_linux:7::server+ 2 more
- cpe:/o:redhat:enterprise_linux:7::serverrange: 0:15.8-1.el7
- cpe:/o:redhat:enterprise_linux:8::baseosrange: 0:15.8-4.el8_9
- cpe:/o:redhat:enterprise_linux:9::baseosrange: 0:15.8-4.el9_3
cpe:/o:redhat:rhel_e4s:8.4::baseos+ 1 more
- cpe:/o:redhat:rhel_e4s:8.4::baseosrange: 0:15.8-2.el8_4
- cpe:/o:redhat:rhel_tus:8.2::baseosrange: 0:15.8-2.el8_2
- Red Hat/Red Hat Enterprise Linux 8.6 Extended Update Supportv5cpe:/o:redhat:rhel_eus:8.6::baseosRange: 0:15.8-2.el8_6
- Red Hat/Red Hat Enterprise Linux 8.8 Extended Update Supportv5cpe:/o:redhat:rhel_eus:8.8::baseosRange: 0:15.8-2.el8
- Red Hat/Red Hat Enterprise Linux 9.2 Extended Update Supportv5cpe:/o:redhat:rhel_eus:9.2::baseosRange: 0:15.8-3.el9_2
- osv-coords29 versionspkg:rpm/almalinux/shim-aa64pkg:rpm/almalinux/shim-ia32pkg:rpm/almalinux/shim-x64pkg:rpm/opensuse/shim&distro=openSUSE%20Leap%2015.5pkg:rpm/opensuse/shim&distro=openSUSE%20Leap%20Micro%205.3pkg:rpm/opensuse/shim&distro=openSUSE%20Leap%20Micro%205.4pkg:rpm/suse/pcr-oracle&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/shim&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Micro%205.1pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Micro%205.2pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Micro%205.3pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Micro%205.4pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Micro%205.5pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP5pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP2pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/shim&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/shim&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/shim&distro=SUSE%20Manager%20Proxy%204.3pkg:rpm/suse/shim&distro=SUSE%20Manager%20Server%204.3
< 15.8-4.el8_9.alma.1+ 28 more
- (no CPE)range: < 15.8-4.el8_9.alma.1
- (no CPE)range: < 15.8-4.el8_9.alma.1
- (no CPE)range: < 15.8-4.el8_9.alma.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 0.4.6-2.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150100.3.38.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-25.30.1
- (no CPE)range: < 15.8-150100.3.38.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-25.30.1
- (no CPE)range: < 15.8-150100.3.38.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-1.1
- (no CPE)range: < 15.8-150300.4.20.2
- (no CPE)range: < 15.8-150300.4.20.2
Patches
Vulnerability mechanics
References
13- access.redhat.com/security/cve/CVE-2023-40547nvdVendor Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingVendor Advisory
- www.openwall.com/lists/oss-security/2024/01/26/1nvd
- access.redhat.com/errata/RHSA-2024:1834nvd
- access.redhat.com/errata/RHSA-2024:1835nvd
- access.redhat.com/errata/RHSA-2024:1873nvd
- access.redhat.com/errata/RHSA-2024:1876nvd
- access.redhat.com/errata/RHSA-2024:1883nvd
- access.redhat.com/errata/RHSA-2024:1902nvd
- access.redhat.com/errata/RHSA-2024:1903nvd
- access.redhat.com/errata/RHSA-2024:1959nvd
- access.redhat.com/errata/RHSA-2024:2086nvd
- lists.debian.org/debian-lts-announce/2024/05/msg00009.htmlnvd
News mentions
0No linked articles in our index yet.