CVE-2022-39293Network attack vector

Memory corruption via underflowed PIMA response length

Published Oct 13, 2022 · Updated Apr 23, 2025

Buffer overflow in Eclipse ThreadX USBX before 6.1.12 allows remote attackers to corrupt host memory via a crafted PIMA response. The _ux_host_class_pima_read function subtracts the PIMA header size and returned transfer length without first rejecting undersized header values, causing unsigned underflow that drives writes beyond the supplied buffer. Reachability requires a host using the PIMA class to process a response from a connected device; exploitation can corrupt memory or interrupt the embedded system.

CVSS severity8.6
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Eclipse ThreadX USBX before 6.1.12 allows remote attackers to corrupt host memory via a crafted PIMA response. The _ux_host_class_pima_read function subtracts the PIMA header size and returned transfer length without first rejecting undersized header values, causing unsigned underflow that drives writes beyond the supplied buffer. Reachability requires a host using the PIMA class to process a response from a connected device; exploitation can corrupt memory or interrupt the embedded system.

The record

CVE
CVE-2022-39293
Published
Oct 13, 2022
Updated
Apr 23, 2025
Vendor
The Eclipse Foundation
Product
Eclipse ThreadX USBX
Classifications
CWE-191, T1200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 6.1.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse ThreadX USBXversion=< 6.1.12

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.6GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1200Hardware Additions

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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