CVE-2026-30649 Overview
CVE-2026-30649 is a stack-based buffer overflow [CWE-121] in the VIVOTEK FD8136 network camera running firmware version 0300a. The flaw resides in the set_getparam.cgi component of the device's embedded web interface. A remote attacker can send a crafted HTTP request to trigger the overflow and execute arbitrary code on the camera. The vulnerability requires no authentication and no user interaction, and it is reachable over the network.
Critical Impact
Unauthenticated remote code execution on an Internet-facing IP camera can convert the device into a foothold for lateral movement, surveillance tampering, or botnet recruitment.
Affected Products
- VIVOTEK FD8136 fixed dome network camera (hardware)
- VIVOTEK FD8136 firmware version 0300a
- Deployments exposing the set_getparam.cgi endpoint to untrusted networks
Discovery Timeline
- 2026-06-02 - CVE-2026-30649 published to the National Vulnerability Database
- 2026-06-03 - Last updated in NVD database
- 2026-06-04 - EPSS score recorded at 0.18% (percentile 39.3)
Technical Details for CVE-2026-30649
Vulnerability Analysis
The FD8136 exposes a CGI-based configuration interface used to read and write camera parameters. The set_getparam.cgi handler parses attacker-controlled query string or POST parameters and copies them into fixed-size stack buffers without enforcing length checks. Supplying an oversized value overflows the buffer, corrupts the saved return address, and redirects execution on the MIPS or ARM-based firmware.
Because the CGI binary runs with elevated privileges inside the camera's embedded Linux environment, successful exploitation grants full control of the device. An attacker can persist on the camera, intercept video streams, disable recording, or pivot into adjacent network segments. Research artifacts published on the GitHub CVE-2026-30649 Research repository document the affected code path.
Root Cause
The root cause is unsafe string handling inside set_getparam.cgi. The component uses unbounded copy operations such as strcpy or sprintf on attacker-supplied request parameters. The embedded firmware lacks modern exploit mitigations, so stack canaries and ASLR do not reliably interrupt exploitation chains.
Attack Vector
The attack is performed remotely over HTTP or HTTPS. An attacker reaches the camera's web service, issues a request to /cgi-bin/admin/set_getparam.cgi with an oversized parameter value, and triggers the overflow. No credentials are required, and the exploit can be delivered in a single request. Cameras exposed to the Internet through port forwarding or misconfigured network address translation are at the highest risk.
Detection Methods for CVE-2026-30649
Indicators of Compromise
- HTTP requests targeting /cgi-bin/admin/set_getparam.cgi with parameter values exceeding several hundred bytes
- Unexpected outbound connections from the camera to unknown command-and-control hosts
- Crash entries or restart loops referencing the CGI handler in device system logs
- New or modified processes running under the camera's web service user
Detection Strategies
- Inspect web traffic to the camera with an intrusion detection system and alert on abnormally long query strings sent to CGI endpoints
- Baseline expected outbound traffic from IP cameras and flag deviations such as IRC, Tor, or unfamiliar HTTPS destinations
- Correlate firmware version 0300a from asset inventories with exposure data to prioritize vulnerable devices
Monitoring Recommendations
- Forward camera syslog and NetFlow data to a centralized analytics platform for retention and correlation
- Monitor for repeated POST requests with binary or non-printable payloads against set_getparam.cgi
- Track authentication failures and configuration changes on cameras to detect post-exploitation activity
How to Mitigate CVE-2026-30649
Immediate Actions Required
- Remove FD8136 cameras running firmware 0300a from direct Internet exposure and place them behind a firewall or VPN
- Restrict management access to the camera web interface to a dedicated administrative VLAN
- Audit network address translation and port forwarding rules that publish camera CGI endpoints externally
Patch Information
No vendor advisory or fixed firmware version is referenced in the NVD entry at the time of publication. Consult the Vivotek Official Website for firmware updates and security bulletins specific to the FD8136 platform. Apply any successor firmware once it is released and validate that the set_getparam.cgi handler is no longer vulnerable.
Workarounds
- Block external access to /cgi-bin/admin/set_getparam.cgi at the perimeter using web application firewall rules or ACLs
- Segment IP cameras onto an isolated network without routable paths to corporate assets or the public Internet
- Disable remote administration features that are not required for daily operations
- Replace end-of-life FD8136 units with supported models if no patched firmware becomes available
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
