CVE-2020-10063Network attack vector

Remote device crash via CoAP option integer overflow

Published Jun 5, 2020 · Updated Sep 17, 2024

Integer overflow in Zephyr RTOS before 2.3.0 allows remote attackers to crash a device with a crafted CoAP option. The parse_option function added attacker-controlled option lengths, deltas, and offsets into 16-bit counters without rejecting arithmetic wraparound. The target must expose an application that passes network CoAP packets to this parser; the documented consequence is service interruption, not data disclosure or modification.

CVSS severity6.8
Medium
EPSS probability1.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Zephyr RTOS before 2.3.0 allows remote attackers to crash a device with a crafted CoAP option. The parse_option function added attacker-controlled option lengths, deltas, and offsets into 16-bit counters without rejecting arithmetic wraparound. The target must expose an application that passes network CoAP packets to this parser; the documented consequence is service interruption, not data disclosure or modification.

The record

CVE
CVE-2020-10063
Published
Jun 5, 2020
Updated
Sep 17, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 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=1.14.0 <unspecified
  2. Affected versionversion=2.1.0 <unspecified
  3. Affected versionversion=2.2.0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=1.14.0 <unspecified; version=2.1.0 <unspecified; version=2.2.0 <unspecified

Published CVSS scores

6.8Zephyr ProjectCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

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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