CVE-2022-33967

Code execution via overflowing inode-table allocation

Published Jul 20, 2022 · Updated Nov 3, 2025

Heap-based buffer overflow in DENX U-Boot 2020.10-rc2 through 2022.07-rc5 allows attackers to execute code via a crafted SquashFS image. sqfs_read_inode_table multiplies an attacker-controlled metadata-block count by SQFS_METADATA_BLOCK_SIZE in malloc without checking for integer overflow, allocating an undersized inode table before later metadata is copied beyond it. Triggering the flaw requires U-Boot to load the crafted local image; the overwrite can crash the bootloader or execute embedded code, including during secure boot.

CVSS severity7.8
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in DENX U-Boot 2020.10-rc2 through 2022.07-rc5 allows attackers to execute code via a crafted SquashFS image. sqfs_read_inode_table multiplies an attacker-controlled metadata-block count by SQFS_METADATA_BLOCK_SIZE in malloc without checking for integer overflow, allocating an undersized inode table before later metadata is copied beyond it. Triggering the flaw requires U-Boot to load the crafted local image; the overwrite can crash the bootloader or execute embedded code, including during secure boot.

The record

CVE
CVE-2022-33967
Published
Jul 20, 2022
Updated
Nov 3, 2025
Vendor
DENX Software Engineering GmbH
Product
U-Boot
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=versions from v2020.10-rc2 to v2022.07-rc5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

DENX Software Engineering GmbH · U-Bootversion=versions from v2020.10-rc2 to v2022.07-rc5

Published CVSS scores

6.6SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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.

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No observations available

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

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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