CVE-2022-24936

Secure boot bypass via out-of-bounds GBL write

Published Nov 2, 2022 · Updated May 2, 2025

An out-of-bounds write in Gecko Bootloader 4.0.1 and earlier allows attackers to overwrite flash signing and OTA decryption keys. The GBL parser processes malicious bootloader-upgrade data beyond its intended memory bounds, allowing that data to reach security-key storage. An unauthenticated attacker able to deliver an upgrade through an adjacent device interface can bypass application secure boot and disrupt affected devices.

CVSS severity8.3
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in Gecko Bootloader 4.0.1 and earlier allows attackers to overwrite flash signing and OTA decryption keys. The GBL parser processes malicious bootloader-upgrade data beyond its intended memory bounds, allowing that data to reach security-key storage. An unauthenticated attacker able to deliver an upgrade through an adjacent device interface can bypass application secure boot and disrupt affected devices.

The record

CVE
CVE-2022-24936
Published
Nov 2, 2022
Updated
May 2, 2025
Vendor
Sigma Designs
Product
Gecko Bootloader
Classifications
CWE-787, CWE-119, T1601.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2022CVE publishedPublication date reported by the CVE source.
  2. May 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.0.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Sigma Designs · Gecko Bootloaderversion=0 <=4.0.1

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
8.3Silicon LabsCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1601.001Patch System Image

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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