CVE-2023-24823Network attack vector

Code execution via undersized IPHC packet buffer

Published Apr 24, 2023 · Updated Feb 4, 2025

Type confusion in RIOT before 2022.10 allows remote attackers to execute arbitrary code by sending a crafted 6LoWPAN frame. The _iphc_encode function sizes a GNRC_NETTYPE_UNDEF packet snippet as an eight-byte UDP header, then compresses a larger IPv6 extension header into that buffer. Network access to the 6LoWPAN processing path is sufficient; the resulting out-of-bounds write corrupts packets or allocator metadata, causing a crash or enabling arbitrary code execution.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Type confusion in RIOT before 2022.10 allows remote attackers to execute arbitrary code by sending a crafted 6LoWPAN frame. The _iphc_encode function sizes a GNRC_NETTYPE_UNDEF packet snippet as an eight-byte UDP header, then compresses a larger IPv6 extension header into that buffer. Network access to the 6LoWPAN processing path is sufficient; the resulting out-of-bounds write corrupts packets or allocator metadata, causing a crash or enabling arbitrary code execution.

The record

CVE
CVE-2023-24823
Published
Apr 24, 2023
Updated
Feb 4, 2025
Vendor
RIOT-OS
Product
RIOT
Classifications
CWE-843, CWE-787, T1210
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo