# CVE-2026-35717: VIVOTEK FD8136 stack overflow in export_language.cgi

Source: https://junglewise.ai/threats/cve-2026-35717-vivotek-fd8136-stack-overflow-in-export-language-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-02. Updated: 2026-06-02  
License: CC BY 4.0 with a link back

CVE-2026-35717 · Severity: info · CVSS 0 · Published 2026-06-02

A security vulnerability exists in VIVOTEK FD8136 network cameras, which are used for professional video surveillance. An authorized user can send a specially crafted web request to the device to take complete control of the camera's operating system. This could allow an attacker to disable surveillance, access private video feeds, or use the device as a foothold to attack other parts of the corporate network.

Vendors: [VIVOTEK](https://junglewise.ai/threats/vendors/vivotek).

## Quick answers

**Is CVE-2026-35717 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35717 being exploited in the wild.

**How severe is CVE-2026-35717?** Informational severity, with a CVSS score of 0, published 2 June 2026.

**Which products and versions are affected?** VIVOTEK FD8136 firmware FD8136-VVTK-0300a.

**Is there a fix for CVE-2026-35717?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-35717 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-35717?** Check whether you run VIVOTEK FD8136 firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the 'export_language.cgi' binary of VIVOTEK FD8136 cameras running firmware version FD8136-VVTK-0300a. The vulnerability is located in the handler for the '/cgi-bin/admin/export_language.cgi' endpoint, which processes POST requests. The application reads attacker-controlled data from stdin and uses a length derived from the 'Content-Length' header or the input itself to perform a memory copy into a fixed-size 0x60-byte stack buffer without bounds checking. Because the binary is compiled without stack canaries, an authenticated attacker can overwrite the saved link register to redirect execution flow. Successful exploitation allows for arbitrary code execution with root privileges.

## Affected products

- VIVOTEK FD8136 firmware FD8136-VVTK-0300a

## Timeline

- 2026-05: disclosed: Discovered by Lewis Patten
- 2026-06-02: advisory: NVD publication date

## References

- [http://vivotek.com/](http://vivotek.com/)
- [https://github.com/xchg-rax-rax/vulnerability-research/tree/main/CVE-2026-35717](https://github.com/xchg-rax-rax/vulnerability-research/tree/main/CVE-2026-35717)

## Related threats

- [VIVOTEK FD8136 stack buffer overflow in motion_privacy.cgi](https://junglewise.ai/threats/cve-2026-35716-vivotek-fd8136-stack-buffer-overflow-in-motion-privacy-cgi)