CVE-2020-10019

Code execution via unchecked DFU upload length

Published May 11, 2020 · Updated Sep 17, 2024

Buffer overflow in Zephyr RTOS USB DFU 1.14.1 and 2.1.0 allows physically proximate attackers to execute code via a crafted upload request. The DFU_UPLOAD handler uses the host-controlled wLength value to fill a fixed request buffer without capping it at USB_REQUEST_BUFFER_SIZE. A malicious host needs direct USB access to a device built with USB DFU upload support; successful memory corruption executes code on the device.

CVSS severity7.8
High
EPSS probability0.45%
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 Zephyr RTOS USB DFU 1.14.1 and 2.1.0 allows physically proximate attackers to execute code via a crafted upload request. The DFU_UPLOAD handler uses the host-controlled wLength value to fill a fixed request buffer without capping it at USB_REQUEST_BUFFER_SIZE. A malicious host needs direct USB access to a device built with USB DFU upload support; successful memory corruption executes code on the device.

The record

CVE
CVE-2020-10019
Published
May 11, 2020
Updated
Sep 17, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-120
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

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

  1. Affected versionversion=1.14.1 <unspecified
  2. Affected versionversion=2.1.0 <unspecified

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=1.14.1 <unspecified; version=2.1.0 <unspecified

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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