CVE-2020-11068Network attack vector

Memory corruption via unchecked JoinAccept frame length

Published Jun 23, 2020 · Updated Aug 4, 2024

Buffer overflow in Semtech LoRaMac-node before 4.4.4 allows remote authenticated users to corrupt memory via a crafted LoRaWAN frame. ProcessRadioRxDone forwards the received size to SecureElementProcessJoinAccept, which decrypts an oversized JoinAccept frame without first enforcing its maximum length. The device must be processing an attacker-controlled JoinAccept frame; published sources do not establish a reliable crash or code-execution outcome.

CVSS severity5.0
Medium
EPSS probability0.92%
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 Semtech LoRaMac-node before 4.4.4 allows remote authenticated users to corrupt memory via a crafted LoRaWAN frame. ProcessRadioRxDone forwards the received size to SecureElementProcessJoinAccept, which decrypts an oversized JoinAccept frame without first enforcing its maximum length. The device must be processing an attacker-controlled JoinAccept frame; published sources do not establish a reliable crash or code-execution outcome.

The record

CVE
CVE-2020-11068
Published
Jun 23, 2020
Updated
Aug 4, 2024
Vendor
Semtech
Product
LoRaMac-node
Classifications
CWE-120
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 4.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Semtech · LoRaMac-nodeversion=< 4.4.4

Published CVSS scores

5.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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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