CVE-2023-24819Public exploitNetwork attack vector

Unauthenticated code execution via undersized reassembly buffer

Published Apr 24, 2023 · Updated Feb 4, 2025

Out-of-bounds write in RIOT before 2022.10 allows remote attackers to execute code or crash devices via crafted 6LoWPAN fragments. During fragmented-datagram reassembly, gnrc_sixlowpan_iphc_recv copies a decompressed IPv6 payload into a packet buffer sized from the smaller compressed frame without verifying the expanded length. No privileges or user interaction are required, but the target must process attacker-supplied fragmented 6LoWPAN traffic; memory corruption can alter packets or allocator metadata before a crash or code execution.

CVSS severity9.8
Critical
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in RIOT before 2022.10 allows remote attackers to execute code or crash devices via crafted 6LoWPAN fragments. During fragmented-datagram reassembly, gnrc_sixlowpan_iphc_recv copies a decompressed IPv6 payload into a packet buffer sized from the smaller compressed frame without verifying the expanded length. No privileges or user interaction are required, but the target must process attacker-supplied fragmented 6LoWPAN traffic; memory corruption can alter packets or allocator metadata before a crash or code execution.

The record

CVE
CVE-2023-24819
Published
Apr 24, 2023
Updated
Feb 4, 2025
Vendor
RIOT-OS
Product
RIOT
Classifications
CWE-787, CWE-131
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

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/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 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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-131Incorrect Calculation of Buffer Size

Public exploit references

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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