CVE-2022-30330Public exploit

Persistent bootloader compromise via unchecked flash ranges

Published May 7, 2022 · Updated Aug 3, 2024

Improper input validation in KeepKey firmware before 7.3.2 allows attackers to overwrite protected flash and trusted bootloader code. In lib/board/supervise.c, the erase handler truncates a 32-bit sector number, range checks miss spanning writes, and flash aliases bypass protected-address checks. Exploitation requires malicious firmware already executing, typically after physical access or installation approved by the device owner; compromise can survive reboots and storage wipes or make the device unrecoverable.

CVSS severity6.6
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in KeepKey firmware before 7.3.2 allows attackers to overwrite protected flash and trusted bootloader code. In lib/board/supervise.c, the erase handler truncates a 32-bit sector number, range checks miss spanning writes, and flash aliases bypass protected-address checks. Exploitation requires malicious firmware already executing, typically after physical access or installation approved by the device owner; compromise can survive reboots and storage wipes or make the device unrecoverable.

The record

CVE
CVE-2022-30330
Published
May 7, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1068, T1542.003
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 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 vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.9NIST NVDAV:L/AC:M/Au:N/C:C/I:C/A:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation
T1542.003Bootkit

Public exploit references

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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