CVE-2023-24820Network attack vector

Device hang via underflowed 6LoWPAN copy length

Published Apr 24, 2023 · Updated Feb 4, 2025

Integer underflow in RIOT-OS RIOT before 2022.10 allows remote attackers to hang devices with a crafted 6LoWPAN frame. gnrc_sixlowpan_iphc_recv subtracts an unchecked payload offset from the packet size and passes the wrapped result to memcpy as its copy length, causing an out-of-bounds write. The affected GNRC 6LoWPAN IPHC path requires no authentication; the resulting unhandled hard fault leaves the device stuck until reset.

CVSS severity7.5
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in RIOT-OS RIOT before 2022.10 allows remote attackers to hang devices with a crafted 6LoWPAN frame. gnrc_sixlowpan_iphc_recv subtracts an unchecked payload offset from the packet size and passes the wrapped result to memcpy as its copy length, causing an out-of-bounds write. The affected GNRC 6LoWPAN IPHC path requires no authentication; the resulting unhandled hard fault leaves the device stuck until reset.

The record

CVE
CVE-2023-24820
Published
Apr 24, 2023
Updated
Feb 4, 2025
Vendor
RIOT-OS
Product
RIOT
Classifications
CWE-787, CWE-191, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=< 2022.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RIOT-OS · RIOTversion=< 2022.10

Published CVSS scores

7.5GitHub, Inc.CVSS: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.

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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-787Out-of-bounds Write
CWE-191Integer Underflow (Wrap 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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