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01 Record

CVE-2025-66646

RIOT-OS has NULL pointer dereference in gnrc_ipv6_ext_frag_reass

LowPUBLISHEDCNA: GitHub_M
CNA base score1.7 CVSS v4.0CVSS: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
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02 Description

RIOT-OS has NULL pointer dereference in gnrc_ipv6_ext_frag_reass

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.67% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 51.8% of scored records. A rank, not a probability.
NVD base score
1.7 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-13.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2025-12-17 19:18Z10 MO AGO
Last updated
2025-12-17 20:30Z10 MO AGO
Reserved
2025-12-05
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Low (CVSS 1.7)
CNA CVSS vector
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
Weaknesses
  • CWE-476NULL Pointer DereferenceBase
Data version
5.2
Document digest
c66f21440d8d1fcb0a9865837f8803df76731b0cdf5485fafe3018ceedcc8a13

05 Affected products

VendorProductVersionsPlatforms
RIOT-OSRIOT< 2025.10—

06 References