Critical

Critical OpenWrt DHCPv6 Flaw Could Let Unauthenticated Attackers Run Code as Root

The Hacker News

July 28, 2026 at 12:56 PM

CVE Exploit Vulnerability Update Critical

Overview

OpenWrt has released version 24.10.8 to address a serious vulnerability in its DHCPv6 service, identified as CVE-2026-53921. This flaw has a CVSS score of 9.8, indicating a high level of risk, as it allows unauthenticated attackers to exploit a stack overflow in the odhcpd component. If attackers can reach the DHCPv6 server, they could potentially execute code with root privileges. This vulnerability affects users running OpenWrt versions that include the vulnerable DHCPv6 stack, which is enabled by default in many configurations. Users are strongly advised to update their systems to maintain security and prevent unauthorized access.

Key Takeaways

Affected Systems: OpenWrt versions with the vulnerable DHCPv6 stack, specifically those using odhcpd.
Action Required: Users should update to OpenWrt version 24.
Timeline: Newly disclosed

Original Article Summary

OpenWrt has shipped version 24.10.8 to close a critical DHCPv6 stack overflow and a wider set of remotely triggerable flaws in network services enabled by default. The critical issue, tracked as CVE-2026-53921 and rated 9.8 on CVSS 3.1 in OpenWrt's GitHub advisory, lets an unauthenticated attacker able to reach the DHCPv6 server overwrite a stack buffer in odhcpd through a crafted DHCPv6

Impact

OpenWrt versions with the vulnerable DHCPv6 stack, specifically those using odhcpd.

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

Users should update to OpenWrt version 24.10.8 or later to mitigate this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability, and 2 more.

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