CVE-2025-67841
Published: 15 April 2026
Summary
CVE-2025-67841 is a high-severity Inefficient Algorithmic Complexity (CWE-407) vulnerability in Nordicsemi (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 18.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-67841 is an algorithmic complexity vulnerability (CWE-407) in Nordic Semiconductor's IronSide SE for nRF54H20, affecting versions before 23.0.2+17. Published on 2026-04-15T16:16:33.997, it carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), highlighting its potential for significant availability disruption without impacting confidentiality or integrity.
Remote attackers require no privileges or user interaction to exploit this issue over the network with low complexity. Exploitation triggers a denial-of-service condition, resulting in high availability impact such as device crashes, reboots, or resource exhaustion due to the algorithmic complexity flaw.
Nordic Semiconductor addresses the vulnerability in security advisory SA-2025-447-v1.1, available at https://docs.nordicsemi.com/bundle/SA/resource/SA-2025-447-v1.1.pdf, with mitigation via an update to IronSide SE version 23.0.2+17 or later. Further resources are on their site at https://nordicsemi.no.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-209487
Vulnerability details
Nordic Semiconductor IronSide SE for nRF54H20 before 23.0.2+17 has an Algorithmic complexity issue.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct remote exploitation of algorithmic complexity leads to application/system resource exhaustion and DoS, matching T1499.004.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires timely identification, reporting, and correction of flaws such as this algorithmic complexity vulnerability via firmware update to version 23.0.2+17.
Implements protections against denial-of-service attacks, including resource exhaustion and device crashes triggered by exploitation of this algorithmic complexity issue.
Validates network inputs to block malicious payloads that exploit the algorithmic complexity flaw leading to availability disruption.