# CVE-2026-114383: TOTOLINK EX200 stack-based buffer overflow in setWiFiAclAddConfig

Source: https://junglewise.ai/threats/cve-2026-114383-a-weakness-has-been-identified-in-totolink-ex200-5-2-3c-7200  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-114383 · Severity: critical · CVSS 10 · Published 2026-10-21

TOTOLINK EX200 is a wireless range extender used to extend network coverage in homes and offices. A remote attacker can crash the device's wireless service or potentially execute arbitrary code by sending a specially crafted request with an overly long MAC address to the web management interface, requiring no authentication or user action.

Technologies: [TOTOLINK EX200](https://junglewise.ai/threats/technologies/ex200). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-114383 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114383 being exploited in the wild.

**How severe is CVE-2026-114383?** Critical severity, with a CVSS score of 10, published 21 October 2026.

**Which products and versions are affected?** TOTOLINK EX200 5.2.3c.7200.

**Is there a fix for CVE-2026-114383?** 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-2026-114383 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-114383?** Check whether you run TOTOLINK EX200 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 (CWE-121) exists in the setWiFiAclAddConfig function within /cgi-bin/cstecgi.cgi, where the unauthenticated macAddress parameter is processed by wireless.so without length validation. The handler tokenizes the parameter with strtok and copies each token into a fixed-size stack buffer using strcat, allowing an attacker to overflow the buffer and corrupt the stack frame. An attacker can send a malicious POST request over the network to trigger a denial of service or potentially achieve remote code execution with the elevated privileges of the wireless.so process.

## Affected products

- TOTOLINK EX200 5.2.3c.7200

## Timeline

- 2026-10-21: disclosed
- other: Exploit made available to the public

## References

- [https://github.com/qwq-nm/CVE/blob/f5d61361eb7d846479f6d76c0aa4273e9af46d27/CVE2/report.md](https://github.com/qwq-nm/CVE/blob/f5d61361eb7d846479f6d76c0aa4273e9af46d27/CVE2/report.md)
- [https://vuldb.com/cve/CVE-2026-114383](https://vuldb.com/cve/CVE-2026-114383)

## Related threats

- [TOTOLINK EX200 stack buffer overflow in setStaticDhcpConfig](https://junglewise.ai/threats/cve-2026-114382-a-security-flaw-has-been-discovered-in-totolink-ex200-5-2-3c)
- [TOTOLINK multiple devices privilege escalation in Web Interface](https://junglewise.ai/threats/cve-2026-15271-totolink-multiple-devices-privilege-escalation-in-web-interface)
- [TOTOLINK EX200 least privilege violation in vsftpd.conf](https://junglewise.ai/threats/cve-2026-11620-totolink-ex200-least-privilege-violation-in-vsftpd-conf)