CVE-2024-9568 Overview
CVE-2024-9568 is a buffer overflow vulnerability in the D-Link DIR-619L B1 2.06 wireless router. The flaw resides in the formAdvNetwork function within the /goform/formAdvNetwork endpoint. Attackers can trigger the overflow by manipulating the curTime argument sent to the router's web interface. The exploit is remotely accessible and has been publicly disclosed, increasing the risk of opportunistic attacks against exposed devices. The affected DIR-619L is an end-of-life consumer router, which limits the availability of official remediation paths [CWE-120].
Critical Impact
Remote attackers with low-privileged access can trigger a buffer overflow in the router's web management interface, potentially leading to arbitrary code execution or denial of service on the affected device.
Affected Products
- D-Link DIR-619L hardware revision B1
- D-Link DIR-619L firmware version 2.06b1
- End-of-life consumer wireless router product line
Discovery Timeline
- 2024-10-07 - CVE-2024-9568 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-9568
Vulnerability Analysis
The vulnerability exists in the formAdvNetwork handler served by the router's embedded HTTP daemon at /goform/formAdvNetwork. This handler processes advanced network configuration requests submitted through the router's web management interface. The curTime request parameter is copied into a fixed-size stack buffer without adequate length validation. Supplying an oversized value causes adjacent stack memory to be overwritten, including saved return addresses on the MIPS-based firmware.
An authenticated attacker on the network can send a crafted HTTP POST request to the vulnerable endpoint to trigger the overflow. Depending on the memory layout and mitigations present on the device, exploitation may result in service crashes, persistent denial of service, or arbitrary code execution in the context of the web daemon. Because the web daemon typically runs with elevated privileges on consumer routers, successful exploitation would grant control over network traffic and DNS configuration.
Root Cause
The root cause is a classic buffer copy without checking the size of input [CWE-120]. The formAdvNetwork function fails to validate the length of the curTime parameter before copying it into a local buffer, violating safe string handling practices on embedded firmware.
Attack Vector
Exploitation requires network access to the router's management interface and low-privileged authenticated access. An attacker submits an HTTP request to /goform/formAdvNetwork containing an oversized curTime value. The malformed request overflows the target buffer and corrupts execution state within the embedded web server process.
No verified public exploit code has been analyzed by SentinelLabs. Technical details for this vulnerability are documented in the GitHub IoT Vulnerability Details and the VulDB Critical Threat Report.
Detection Methods for CVE-2024-9568
Indicators of Compromise
- HTTP POST requests to /goform/formAdvNetwork containing abnormally long curTime parameter values
- Unexpected reboots, watchdog resets, or crashes of the router's web management service
- Unauthorized configuration changes to advanced network settings, DNS, or routing tables
- Outbound connections from the router to unfamiliar hosts following management interface access
Detection Strategies
- Inspect network traffic destined to router management interfaces for oversized POST bodies targeting /goform/ endpoints
- Deploy intrusion detection signatures that match on excessive curTime parameter lengths in HTTP requests to D-Link routers
- Correlate router-originated log events and syslog entries with authentication activity to identify suspicious sessions
Monitoring Recommendations
- Forward router syslog output to a centralized logging platform for retention and analysis
- Alert on repeated failed authentication attempts to router administrative interfaces from internal or external hosts
- Monitor for DNS configuration changes on gateway devices, which often indicate router compromise
How to Mitigate CVE-2024-9568
Immediate Actions Required
- Restrict access to the router's web management interface to trusted internal hosts using firewall rules or ACLs
- Disable remote administration on the WAN interface if enabled
- Change default and weak administrator credentials to reduce the risk of authenticated exploitation
- Segment the router's management plane from untrusted user networks and IoT devices
Patch Information
The D-Link DIR-619L is a legacy product line and no official patch is referenced in the CVE data. Organizations still operating this hardware should plan replacement with a supported router platform. Review the D-Link Official Website for current product support status and end-of-life notices.
Workarounds
- Replace the affected DIR-619L device with a currently supported router that receives active firmware updates
- Place the router behind an additional network security appliance that filters management interface traffic
- Disable unused services on the router, including UPnP and remote management protocols
- Isolate the vulnerable device on a dedicated VLAN with strict egress controls until replacement
# Example: restrict access to router management interface using an upstream firewall
iptables -A FORWARD -p tcp -d 192.0.2.1 --dport 80 -s 192.0.2.100 -j ACCEPT
iptables -A FORWARD -p tcp -d 192.0.2.1 --dport 80 -j DROP
iptables -A FORWARD -p tcp -d 192.0.2.1 --dport 443 -s 192.0.2.100 -j ACCEPT
iptables -A FORWARD -p tcp -d 192.0.2.1 --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
