CVE-2023-24825 | RIOT-OS vulnerable to NULL pointer dereference in gnrc_pktbuf_mark

RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. Prior to version 2023.04, an attacker can send a crafted frame to the device to trigger a NULL pointer dereference leading to denial of service. This issue is fixed in version 2023.04. There are no known workarounds.

Published: 2023-05-30 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-24825 is rated Moderate Risk (49.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.96%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-24825

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.31% 0.96% -0.36%
2 2026-05-31 0.37% 1.31% +0.94%
3 2026-02-22 — 0.37% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-24825

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-24825

Affected software / configurations for CVE-2023-24825

Vendor Product Version Raw CPE
riot-os riot < 2023.04 cpe:2.3:o:riot-os:riot:*:*:*:*:*:*:*:*

References for CVE-2023-24825

URL Tags
https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L416 Vendor Advisory
https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c#L429 Vendor Advisory
https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L729 Vendor Advisory
https://github.com/RIOT-OS/RIOT/blob/2022.10-branch/sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c#L761 Mailing List
https://github.com/RIOT-OS/RIOT/blob/ccbb304eae7b59e8aca24a6ffd095b5b3f7720ee/sys/net/gnrc/pktbuf_static/gnrc_pktbuf_static.c#L169 Vendor Advisory
https://github.com/RIOT-OS/RIOT/commit/0c522075445a62ce3102e141573ecc2788521897 Patch Vendor Advisory
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-xqm8-xj74-fjw2 Vendor Advisory
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