Vulnerability in Eurosoft-Uk Uefi Bootloader
CVE-2022-34303
A flaw was found in Eurosoft bootloaders before 2022-06-01. An attacker may use this bootloader to bypass or tamper with Secure Boot protections. In order to load and execute arbitrary code in the pre-boot stage, an attacker simply needs to replace the existing signed bootloader currently in use with this bootloader. Access to the EFI System Partition is required for booting using external media.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (56.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Eurosoft-Uk Uefi Bootloader
- Microsoft Windows 10 — versions 20h2, 21h1, 21h2
- Microsoft Windows 11
- Microsoft Windows 8.1
- Microsoft Windows Rt 8.1
- Microsoft Windows Server 2012 — versions r2
- Microsoft Windows Server 2016 — versions 20h2
- Microsoft Windows Server 2019
- Microsoft Windows Server 2022
- Red Hat Enterprise Linux — versions 7.0, 8.0, 9.0
Public proof-of-concept exploits
References
- edk2-docs.gitbook.io/understanding-the-uefi-secure-boot-chain/secure_boot_chain… (Third Party Advisory)
- www.kb.cert.org/vuls/id/309662 (US Government Resource, Third Party Advisory)
- www.intel.com/content/www/us/en/security-center/advisory/intel-sa-01001.html
Frequently asked questions
- What is CVE-2022-34303?
- CVE-2022-34303 is a medium-severity vulnerability in Eurosoft-Uk Uefi Bootloader. CVSS score: 6.7/10. Published 2022-08-26.
- How severe is CVE-2022-34303?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2022-34303 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.