CVE-2022-34301

Pre-boot code execution via trusted EFI shell

Published Aug 26, 2022 · Updated Aug 3, 2024

Secure Boot bypass in CryptoPro Secure Disk bootloaders before 2022-06-01 allows local users to execute arbitrary pre-boot code. The signed bootloader exposes an EFI shell that launches unsigned code without enforcing the Secure Boot trust policy. Exploitation requires privileged access to replace the signed bootloader on the EFI System Partition and boot from external media; code then runs before operating-system defenses.

CVSS severity6.7
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Secure Boot bypass in CryptoPro Secure Disk bootloaders before 2022-06-01 allows local users to execute arbitrary pre-boot code. The signed bootloader exposes an EFI shell that launches unsigned code without enforcing the Secure Boot trust policy. Exploitation requires privileged access to replace the signed bootloader on the EFI System Partition and boot from external media; code then runs before operating-system defenses.

The record

CVE
CVE-2022-34301
Published
Aug 26, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1542.003
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.7IntelCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1542.003Pre-OS Boot: Bootkit

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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