# CVE-2026-121599: TOTOLINK A950RG stack buffer overflow in WiFi configuration

Source: https://junglewise.ai/threats/cve-2026-121599-a-vulnerability-was-detected-in-totolink-a950rg-4-1-2cu-5268  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-121599 · Severity: critical · CVSS 9.9 · Published 2026-11-04

The TOTOLINK A950RG router's WiFi configuration interface contains a stack buffer overflow vulnerability that allows an attacker with network access to the management interface to execute arbitrary code on the device. This could enable an attacker to take complete control of the router, intercepting traffic, modifying network settings, or using it as a foothold to attack other devices on the network.

Technologies: [TOTOLINK A950rg](https://junglewise.ai/threats/technologies/a950rg). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-121599 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121599 being exploited in the wild.

**How severe is CVE-2026-121599?** Critical severity, with a CVSS score of 9.9, published 4 November 2026.

**Which products and versions are affected?** TOTOLINK A950rg 4.1.2cu.5268_B20221104.

**Is there a fix for CVE-2026-121599?** 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-2026-121599 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-121599?** Check whether you run TOTOLINK A950rg 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

The setWiFiMultipleConfig and delWiFiMultipleConfig functions in the wireless.so library use unbounded strcpy to copy WEP key parameters (wepkey2 and wepkey3) into a 68-byte stack buffer, allowing overwrite of the saved return address with 129+ bytes of input. The device is non-PIE with no stack canaries and no ASLR, enabling predictable code execution. A valid session token is required, but a pre-authentication disclosure flaw (A950RG-INFO-01) can bypass this requirement.

## Affected products

- TOTOLINK A950RG 4.1.2cu.5268_B20221104

## Timeline

- 2026-11-04: disclosed

## References

- [https://gist.github.com/H3rmesk1t/44673654282c9b21bc8971bab7e4b8a3](https://gist.github.com/H3rmesk1t/44673654282c9b21bc8971bab7e4b8a3)
- [https://vuldb.com/cve/CVE-2026-121599](https://vuldb.com/cve/CVE-2026-121599)

## Related threats

- [TOTOLINK A950RG stack buffer overflow in MAC filter handler](https://junglewise.ai/threats/cve-2026-121600-a-flaw-has-been-found-in-totolink-a950rg-4-1-2cu-5268-b20221104)
- [TOTOLINK A950RG stack buffer overflow in wireless configuration](https://junglewise.ai/threats/cve-2026-121598-a-security-vulnerability-has-been-detected-in-totolink-a950rg-4)
- [TOTOLINK A950RG stack buffer overflow in Easy Setup Wizard](https://junglewise.ai/threats/cve-2026-121597-a-weakness-has-been-identified-in-totolink-a950rg-4-1-2cu-5268)
- [TOTOLINK A950RG stack buffer overflow in infostat.cgi](https://junglewise.ai/threats/cve-2026-116508-a-security-flaw-has-been-discovered-in-totolink-a950rg-4-1-2cu)
- [TOTOLINK A950RG information disclosure in getLanguageCfg](https://junglewise.ai/threats/cve-2026-116507-a-vulnerability-was-identified-in-totolink-a950rg-4-1-2cu-5268)