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CVE-2022-34303

MEDIUMCVSS 6.7/10EPSS 0.80%

Last modified

CVE-2022-34303 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. 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. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.80%

51.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
Eurosoft-UkUefi Bootloader< 2022-06-01
RedhatEnterprise Linux7.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux9.0
MicrosoftWindows 10All versions
MicrosoftWindows 1020h2
MicrosoftWindows 1021h1
MicrosoftWindows 1021h2
MicrosoftWindows 101607
MicrosoftWindows 101809
MicrosoftWindows 11All versions
MicrosoftWindows 8.1All versions
MicrosoftWindows Rt 8.1All versions
MicrosoftWindows Server 2012All versions
MicrosoftWindows Server 2012r2
MicrosoftWindows Server 2016All versions
MicrosoftWindows Server 201620h2
MicrosoftWindows Server 2019All versions
MicrosoftWindows Server 2022All versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2022-34303?
CVE-2022-34303 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.
How do I fix CVE-2022-34303?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-34303?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST