CVE-2025-70226 in DIR-513
Summary
by MITRE • 03/04/2026
Stack buffer overflow vulnerability in D-Link DIR-513 v1.10 via the curTime parameter to goform/formEasySetupWizard.
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Analysis
by VulDB Data Team • 03/06/2026
The vulnerability CVE-2025-70226 represents a stack buffer overflow flaw discovered in the D-Link DIR-513 wireless router firmware version 1.10. This critical security issue resides within the web interface handling of the formEasySetupWizard functionality, specifically when processing the curTime parameter. The affected device operates with a stack-based memory management system where user-supplied input is directly copied to a fixed-size buffer without proper bounds checking, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on the affected device.
The technical implementation of this vulnerability stems from improper input validation within the router's web server component. When the curTime parameter is submitted through the goform/formEasySetupWizard endpoint, the firmware fails to perform adequate size verification before copying the data into a stack-allocated buffer. This allows an attacker to overflow the buffer and overwrite adjacent memory locations including return addresses and control data. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking permits data to overwrite adjacent memory locations. The attack vector is remote and requires no authentication, making it particularly dangerous for networked devices.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise of the affected D-Link router. Successful exploitation could enable attackers to gain root access to the device, allowing them to modify network configurations, install malicious firmware, redirect traffic through the compromised router, or use it as a pivot point for attacking other devices within the local network. The vulnerability affects all users running firmware version 1.10 of the DIR-513 model, which represents a significant portion of deployed devices in both residential and small business environments. This creates a substantial risk profile given that many users may not regularly update their router firmware, leaving them exposed to exploitation.
Mitigation strategies for CVE-2025-70226 should prioritize immediate firmware updates from D-Link, as the vendor is expected to release patches addressing the buffer overflow condition. Network administrators should implement firewall rules to restrict access to the router's web management interface from untrusted networks while monitoring for suspicious traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates characteristics consistent with ATT&CK technique T1059.007 Command and Scripting Interpreter: JavaScript, as exploitation may involve crafting malicious JavaScript payloads to manipulate the web interface parameters. Organizations should also consider implementing network segmentation to limit the potential impact of a successful compromise and deploy intrusion detection systems to monitor for exploitation attempts targeting known vulnerable devices. Additionally, the affected firmware version should be removed from production environments until proper patches are verified and deployed to ensure complete remediation of the stack buffer overflow condition.