CVE-2024-8573 Overview
CVE-2024-8573 is a buffer overflow vulnerability affecting TOTOLINK AC1200 T8 and AC1200 T10 routers. The flaw resides in the setParentalRules function within /cgi-bin/cstecgi.cgi. Attackers can manipulate the desc, week, sTime, or eTime parameters to trigger memory corruption [CWE-119]. The attack is remotely exploitable and requires only low-level privileges. Public exploit details have been disclosed, increasing exposure risk for affected devices. The vendor was contacted about the disclosure but did not respond, leaving devices without an official patch.
Critical Impact
Remote attackers with low privileges can trigger buffer overflow in TOTOLINK T8/T10 routers, potentially leading to arbitrary code execution and full device compromise.
Affected Products
- TOTOLINK AC1200 T8 firmware version 4.1.5cu.861_B20230220
- TOTOLINK AC1200 T10 firmware version 4.1.8cu.5207
- TOTOLINK AC1200 T8 and T10 hardware devices
Discovery Timeline
- 2024-09-08 - CVE-2024-8573 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-8573
Vulnerability Analysis
The vulnerability exists in the setParentalRules handler exposed through /cgi-bin/cstecgi.cgi on TOTOLINK AC1200 T8 and T10 routers. The CGI endpoint processes HTTP requests containing parental control configuration parameters. When the handler processes the desc, week, sTime, or eTime arguments, it copies user-supplied input into fixed-size stack buffers without validating input length. This classic boundary condition failure [CWE-119] allows an attacker to overrun buffer boundaries and overwrite adjacent memory, including saved return addresses on the stack.
Additional parameters passed to setParentalRules may exhibit the same weakness, expanding the exploitable attack surface. Public documentation of the flaw is available in the GitHub IoT Vulnerability Documentation.
Root Cause
The root cause is the absence of bounds checking on user-controlled string parameters before they are copied into stack buffers. The CGI binary uses unsafe string handling routines that trust the length of attacker-controlled input. Because embedded MIPS-based router firmware typically lacks modern exploit mitigations such as ASLR and stack canaries, memory corruption reliably translates into control-flow hijacking.
Attack Vector
An attacker sends a crafted HTTP POST request to /cgi-bin/cstecgi.cgi with an oversized value in the desc, week, sTime, or eTime field targeting the setParentalRules action. The request requires authenticated access at a low privilege level. Successful exploitation corrupts the device stack and can lead to denial of service or arbitrary code execution in the router's management context. Additional exploitation details are cataloged in VulDB #276807.
Detection Methods for CVE-2024-8573
Indicators of Compromise
- HTTP POST requests to /cgi-bin/cstecgi.cgi containing abnormally long desc, week, sTime, or eTime parameter values
- Unexpected router reboots or crashes correlating with parental control configuration requests
- Outbound connections from the router to unfamiliar external hosts following management-plane activity
- Unauthorized changes to parental control rules or router firmware configuration
Detection Strategies
- Deploy network-based intrusion detection signatures that inspect HTTP requests to cstecgi.cgi for parameter lengths exceeding expected boundaries
- Monitor router syslog output for segmentation faults or watchdog-triggered restarts on the httpd or CGI process
- Baseline normal parental control configuration traffic and flag deviations in request size or frequency
Monitoring Recommendations
- Log and inspect all administrative HTTP traffic to TOTOLINK devices at network chokepoints
- Alert on repeated failed or oversized requests targeting the setParentalRules endpoint
- Track firmware versions across managed router fleets to identify vulnerable T8 and T10 units
How to Mitigate CVE-2024-8573
Immediate Actions Required
- Restrict management interface access to trusted internal networks and block WAN-side exposure of the router administration port
- Change default administrative credentials to reduce the risk of low-privilege attacker access required for exploitation
- Segment vulnerable TOTOLINK T8 and T10 devices from sensitive network zones until a vendor fix is available
- Consider replacing unsupported devices given the vendor's lack of response to disclosure
Patch Information
No official patch has been released. According to the CVE record, the vendor was contacted early about this disclosure but did not respond. Organizations should monitor the TOTOLink Official Website for future firmware updates and treat affected devices as unpatched.
Workarounds
- Disable remote administration on the WAN interface to prevent external exploitation attempts
- Place affected routers behind a firewall that filters unsolicited HTTP traffic to management endpoints
- Enforce strong, unique administrator passwords to raise the barrier for the low-privilege authentication required by the exploit
- Replace affected TOTOLINK T8 and T10 units with actively maintained hardware where operational risk is unacceptable
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
