# CVE-2026-124057: TOTOLINK CA300-PoE buffer overflow in setWiFiMultipleConfig

Source: https://junglewise.ai/threats/cve-2026-124057-a-security-flaw-has-been-discovered-in-totolink-ca300-poe-6-2c  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-07. Updated: 2026-11-07  
License: CC BY 4.0 with a link back

CVE-2026-124057 · Severity: critical · CVSS 9.1 · Published 2026-11-07

TOTOLINK CA300-PoE is a network access point used to provide wireless connectivity in business and institutional environments. A buffer overflow vulnerability in its configuration interface allows remote attackers to execute arbitrary code and take complete control of the device without authentication, potentially compromising all connected networks and data.

Technologies: [TOTOLINK CA300-PoE](https://junglewise.ai/threats/technologies/ca300-poe). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-124057 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124057 being exploited in the wild.

**How severe is CVE-2026-124057?** Critical severity, with a CVSS score of 9.1, published 7 November 2026.

**Which products and versions are affected?** TOTOLINK CA300-PoE 6.2c.884.

**Is there a fix for CVE-2026-124057?** 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-2026-124057 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-124057?** Check whether you run TOTOLINK CA300-PoE 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 buffer overflow exists in the setWiFiMultipleConfig function within /cgi-bin/cstecgi.cgi, exploitable via manipulation of the Key1Str1 parameter. The vulnerability is remotely exploitable over the network with no authentication required. Successful exploitation grants arbitrary code execution with device privileges.

## Affected products

- TOTOLINK CA300-PoE 6.2c.884

## Timeline

- 2026-11-07: disclosed
- other: Exploit released to public

## References

- [https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiMultipleConfig-3f953a41781f800fab65eaa6a2887fa1?source=copy_link](https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiMultipleConfig-3f953a41781f800fab65eaa6a2887fa1?source=copy_link)
- [https://vuldb.com/cve/CVE-2026-124057](https://vuldb.com/cve/CVE-2026-124057)

## Related threats

- [TOTOLINK CA300-PoE buffer overflow in UploadCustomModule](https://junglewise.ai/threats/cve-2026-124060-a-vulnerability-was-detected-in-totolink-ca300-poe-6-2c-884)
- [TOTOLINK CA300-PoE buffer overflow in WiFi configuration](https://junglewise.ai/threats/cve-2026-124059-a-security-vulnerability-has-been-detected-in-totolink-ca300-poe)
- [TOTOLINK CA300-PoE buffer overflow in WiFi repeater configuration](https://junglewise.ai/threats/cve-2026-124058-a-weakness-has-been-identified-in-totolink-ca300-poe-6-2c-884)
- [TOTOLINK CA300-PoE buffer overflow in setWiFiBasicConfig](https://junglewise.ai/threats/cve-2026-123961-a-security-vulnerability-has-been-detected-in-totolink-ca300-poe)
- [TOTOLINK CA300-PoE buffer overflow in setWanConfig](https://junglewise.ai/threats/cve-2026-123960-a-weakness-has-been-identified-in-totolink-ca300-poe-6-2c-884)