CVE-2020-10022Network attack vector

Code execution via unbounded UpdateHub hash copy

Published May 11, 2020 · Updated Sep 16, 2024

Buffer overflow in Zephyr RTOS 2.1.0 and 2.2.0 allows remote attackers to corrupt memory via a malformed UpdateHub JSON response. The UpdateHub parser copies a variable-length firmware hash string from received metadata into a fixed-size array without enforcing its bound. Reachability requires UpdateHub to process server-supplied metadata; the overflow can crash the device or enable code execution.

CVSS severity9.0
Critical
EPSS probability2.32%
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 2.1.0 and 2.2.0 allows remote attackers to corrupt memory via a malformed UpdateHub JSON response. The UpdateHub parser copies a variable-length firmware hash string from received metadata into a fixed-size array without enforcing its bound. Reachability requires UpdateHub to process server-supplied metadata; the overflow can crash the device or enable code execution.

The record

CVE
CVE-2020-10022
Published
May 11, 2020
Updated
Sep 16, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=2.1.0 <unspecified
  2. Affected versionversion=2.2.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=2.1.0 <unspecified; version=2.2.0 <unspecified

Published CVSS scores

9.8NIST NVDCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.0Zephyr Project CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5NIST NVDAV:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

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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