CVE-2025-66646— RIOT-OS has NULL pointer dereference in gnrc_ipv6_ext_frag_reass
Quick assessment
Affected
RIOT-OS RIOT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
RIOT是RIOT开源的一套应用于物联网领域的操作系统。 RIOT v2025.07版本存在代码问题漏洞，该漏洞源于IPv6分片重组实现存在空指针取消引用，可能导致操作系统崩溃。
Possible ATT&CK Techniques 2 AI
T1133 · External Remote Services T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2025-66646
Vulnerability Information
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Vulnerability Title
RIOT-OS has NULL pointer dereference in gnrc_ipv6_ext_frag_reass
Source: CVE Program / CVE List V5
Vulnerability Description
RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. A vulnerability was discovered in the IPv6 fragmentation reassembly implementation of RIOT OS v2025.07. When receiving an fragmented IPv6 packet with fragment offset 0 and an empty payload, the payload pointer is set to NULL. However, the implementation still tries to copy the payload into the reassembly buffer, resulting in a NULL pointer dereference which crashes the OS (DoS). To trigger the vulnerability, the `gnrc_ipv6_ext_frag` module must be enabled and the attacker must be able to send arbitrary IPv6 packets to the victim. RIOT OS v2025.10 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
RIOT 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RIOT是RIOT开源的一套应用于物联网领域的操作系统。 RIOT v2025.07版本存在代码问题漏洞，该漏洞源于IPv6分片重组实现存在空指针取消引用，可能导致操作系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-66646
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Vendor Advisories for CVE-2025-66646 (1)
-
https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-v8gx-q9m6-5xm9 x_refsource_CONFIRM
Other References for CVE-2025-66646 (9)
-
https://github.com/RIOT-OS/RIOT/releases/tag/2025.10 x_refsource_MISC
-
https://github.com/user-attachments/files/23903992/reproducer_1.zip x_refsource_MISC
IV. Related Vulnerabilities
Same product: RIOT
-
CVE-2026-27703
RIOT has an Out-of-Bounds Write in nanoCoAP Handler -
CVE-2026-25139
RIOT Vulnerable to Multiple Out-of-Bounds Read When Processi -
CVE-2025-66647
RIOT OS has buffer overflow in gnrc_ipv6_ext_frag_reass -
CVE-2025-53888
RIOT-OS has an ineffective size check that can lead to buffe -
CVE-2024-53980
Spoofed length byte traps CC2538 in endless loop
Same vendor: RIOT-OS
-
CVE-2026-27703
RIOT has an Out-of-Bounds Write in nanoCoAP Handler -
CVE-2026-25139
RIOT Vulnerable to Multiple Out-of-Bounds Read When Processi -
CVE-2025-66647
RIOT OS has buffer overflow in gnrc_ipv6_ext_frag_reass -
CVE-2025-53888
RIOT-OS has an ineffective size check that can lead to buffe -
CVE-2024-53980
Spoofed length byte traps CC2538 in endless loop
Same weakness: CWE-476
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V. Comments for CVE-2025-66646
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