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CVE Record

CVE-2022-33967: squashfs filesystem implementation of U-Boot versions from v2020.10-rc2 to v2022.07-rc5 contains a heap-bas...

squashfs filesystem implementation of U-Boot versions from v2020.10-rc2 to v2022.07-rc5 contains a heap-based buffer overflow vulnerability due to a defect in the metadata reading process. Loading a specially crafted squashfs image may lead to a denial-of-service (DoS) condition or arbitrary code execution.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects U-Boot’s SquashFS handling. If a vulnerable bootloader loads a malicious SquashFS image, it can crash or potentially execute code before the operating system starts. Business risk is highest for embedded devices or appliances where boot media, recovery images, or update paths can be influenced by an attacker.

Executive priority

Prioritize affected products where attackers can influence boot media or firmware images. Treat internet-facing management alone as insufficient evidence of exposure unless it can trigger vulnerable U-Boot SquashFS loading.

Technical view

CVE-2022-33967 is a heap-based buffer overflow in U-Boot SquashFS metadata reading, affecting versions from v2020.10-rc2 to v2022.07-rc5. The source bundle links a DENX fix commit and JVN advisory. Impact is denial of service or possible arbitrary code execution when loading a crafted SquashFS image.

Likely exposure

Exposure is likely limited to systems using affected U-Boot versions with SquashFS filesystem support, especially embedded devices, appliances, or recovery/update flows that load SquashFS images.

Exploitation context

The provided sources do not show KEV listing or active exploitation. Exploitation depends on causing vulnerable U-Boot to load a specially crafted SquashFS image, which may require access to boot media, firmware update paths, or recovery mechanisms.

Researcher notes

The bundle provides affected version range and impact but no CVSS, CWE, or confirmed exploitation. Analysis should focus on U-Boot version, SquashFS configuration, and trust boundaries around boot/update artifacts rather than generic network exposure.

Mitigation direction

  • Update U-Boot to a vendor or distribution build containing the DENX fix.
  • If maintaining a fork, compare and apply the referenced upstream fix commit.
  • Restrict boot and recovery media to trusted, signed images where supported.
  • Avoid loading untrusted SquashFS images on affected U-Boot builds.
  • Check DENX, JVN, and downstream distribution advisories for package-specific guidance.

Validation and detection

  • Inventory devices and firmware using U-Boot v2020.10-rc2 through v2022.07-rc5.
  • Confirm whether SquashFS support is built into each U-Boot image.
  • Compare local U-Boot source against commit 7f7fb9937c6cb49dd35153bd6708872b390b0a44.
  • Verify updated firmware or distribution packages include the fix.
  • Review boot, recovery, and update paths for attacker-controlled SquashFS images.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2022-33967 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
DENX Software EngineeringU-Bootversions from v2020.10-rc2 to v2022.07-rc5Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.