CVE catalog
CVE-2023-40550
shim: CVE-2023-40550
- Severity
- Medium · CVSS 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.40% · Oct 25, 2026
An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | shim | sid | 16.1-2 | fixed |
| Debian | shim | forky | 16.1-2 | fixed |
| Debian | shim | trixie | 16.1-2~deb13u1 | fixed |
| Debian | shim | bookworm | 16.1-2~deb12u1 | fixed |
| Ubuntu | shim | 14.04 | 0.4-0ubuntu4 | vulnerable |
| Ubuntu | shim | 14.04 | 0.8-0ubuntu2 | vulnerable |
| Ubuntu | shim | 14.04 | 0.9+1474479173.6c180c6-1ubuntu1 | vulnerable |
| Ubuntu | shim | 14.04 | 13-0ubuntu2 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.3 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.4 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.5 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.6 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.9 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.17~14.04.1 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.18~14.04.1 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.19~14.04.1 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.32~14.04.2 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.33.1~14.04.2 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.33.1~14.04.3 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.33.1~14.04.4 | vulnerable |
| Ubuntu | shim-signed | 14.04 | 1.33.1~14.04.5 | vulnerable |
| Ubuntu | shim | 16.04 | 0.8-0ubuntu2 | vulnerable |
| Ubuntu | shim | 16.04 | 0.9+1474479173.6c180c6-1ubuntu1 | vulnerable |
| Ubuntu | shim | 16.04 | 13-0ubuntu2 | vulnerable |
| Ubuntu | shim | 16.04 | 15+1533136590.3beb971-0ubuntu1 | vulnerable |
| Ubuntu | shim | 16.04 | 15+1552672080.a4a1fbe-0ubuntu2 | vulnerable |
| Ubuntu | shim | 16.04 | 15.4-0ubuntu7 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.11 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.12 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.17~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.18~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.19~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.27~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.28~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.32~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.1 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.2 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.3 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.4 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.5 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.6 | vulnerable |
| Ubuntu | shim-signed | 16.04 | 1.33.1~16.04.10 | vulnerable |
| Ubuntu | shim | 18.04 | 0.9+1474479173.6c180c6-1ubuntu1 | vulnerable |
| Ubuntu | shim | 18.04 | 13-0ubuntu2 | vulnerable |
| Ubuntu | shim | 18.04 | 15+1533136590.3beb971-0ubuntu1 | vulnerable |
| Ubuntu | shim | 18.04 | 15+1552672080.a4a1fbe-0ubuntu2 | vulnerable |
| Ubuntu | shim | 18.04 | 15.4-0ubuntu7 | vulnerable |
| Ubuntu | shim | 18.04 | 15.4-0ubuntu9 | vulnerable |
| Ubuntu | shim | 18.04 | 15.7-0ubuntu1 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.32 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.33.1 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.4 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.5 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.6 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.7 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.8 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.9 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.9.1 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.34.9.2 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.1 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.2 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.3 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.6 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.8 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.10 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.11 | vulnerable |
| Ubuntu | shim-signed | 18.04 | 1.37~18.04.13 | vulnerable |
| Ubuntu | shim | 20.04 | 15+1533136590.3beb971-0ubuntu1 | vulnerable |
| Ubuntu | shim | 20.04 | 15+1552672080.a4a1fbe-0ubuntu1 | vulnerable |
| Ubuntu | shim | 20.04 | 15+1552672080.a4a1fbe-0ubuntu2 | vulnerable |
| Ubuntu | shim | 20.04 | 15.4-0ubuntu7 | vulnerable |
| Ubuntu | shim | 20.04 | 15.4-0ubuntu9 | vulnerable |
| Ubuntu | shim | 20.04 | 15.7-0ubuntu1 | vulnerable |
| Ubuntu | shim | 20.04 | 15.8-0ubuntu1 | fixed |
| Ubuntu | shim-signed | 20.04 | 1.39 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.3 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.4 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.6 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.7 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.9 | vulnerable |
| Ubuntu | shim-signed | 20.04 | 1.40.10 | fixed |
| Ubuntu | shim | 22.04 | 15.4-0ubuntu9 | vulnerable |
| Ubuntu | shim | 22.04 | 15.7-0ubuntu1 | vulnerable |
| Ubuntu | shim | 22.04 | 15.8-0ubuntu1 | fixed |
| Ubuntu | shim-signed | 22.04 | 1.51 | vulnerable |
| Ubuntu | shim-signed | 22.04 | 1.51.3 | vulnerable |
| Ubuntu | shim-signed | 22.04 | 1.51.4 | fixed |
| Ubuntu | shim | 24.04 | 15.7-0ubuntu1 | vulnerable |
| Ubuntu | shim | 24.04 | 15.8-0ubuntu1 | fixed |
| Ubuntu | shim-signed | 24.04 | 1.56 | vulnerable |
| Ubuntu | shim-signed | 24.04 | 1.57 | vulnerable |
| Ubuntu | shim-signed | 24.04 | 1.58 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | shim | source | sid | 15.8-1 | not yet assigned | Not reported | [1061519] |
| Debian | shim | source | forky | 15.8-1 | not yet assigned | Not reported | [1061519] |
| Debian | shim | source | trixie | 15.8-1 | not yet assigned | Not reported | [1061519] |
| Debian | shim | source | bookworm | 15.8-1~deb12u1 | not yet assigned | Not reported | [1061519] |
| Ubuntu | shim | deb | 20.04 | 15.8-0ubuntu1 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
| Ubuntu | shim-signed | deb | 20.04 | 1.40.10 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
| Ubuntu | shim | deb | 22.04 | 15.8-0ubuntu1 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
| Ubuntu | shim-signed | deb | 22.04 | 1.51.4 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
| Ubuntu | shim | deb | 24.04 | 15.8-0ubuntu1 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
| Ubuntu | shim-signed | deb | 24.04 | 1.58 | Not reported | UBUNTU-CVE-2023-40550 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://ftp.suse.com/pub/projects/security/csaf/esba-2024_0600.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-40550]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2023-40550]
- [https://security-tracker.debian.org/tracker/CVE-2023-40550]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-40550.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-2100.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]