# CVE-2026-10189: Tenda W12 stack overflow in cgiSysTimeInfoSet

Source: https://junglewise.ai/threats/cve-2026-10189-tenda-w12-stack-overflow-in-cgisystimeinfoset  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-31. Updated: 2026-05-31  
License: CC BY 4.0 with a link back

CVE-2026-10189 · Severity: high · CVSS 8.8 · Published 2026-05-31

A security vulnerability exists in the Tenda W12 wireless router, a device used to provide internet connectivity in homes and small offices. An attacker can exploit this flaw to crash the device or potentially take full control of it by sending specially crafted data to the router's management interface. This could lead to a complete loss of internet service or unauthorized access to the network's traffic.

Technologies: [Tenda W12](https://junglewise.ai/threats/technologies/w12). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-10189 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10189 being exploited in the wild.

**How severe is CVE-2026-10189?** High severity, with a CVSS score of 8.8, published 31 May 2026.

**Which products and versions are affected?** Tenda W12 3.0.0.7(4763).

**Is there a fix for CVE-2026-10189?** 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-2026-10189 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-10189?** Check whether you run Tenda W12 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 vulnerability exists in the Tenda W12 router, specifically within the 'cgiSysTimeInfoSet' function of the '/bin/httpd' binary. The flaw is triggered by improper validation of the 'sec' argument, allowing an attacker to overwrite the stack. This attack can be initiated remotely over the network, though it requires low-level authentication (PR:L). Successful exploitation can lead to arbitrary code execution or a complete system crash (DoS). Public exploit code has been disclosed, increasing the risk of active exploitation.

## Affected products

- Tenda W12 3.0.0.7(4763)

## Timeline

- 2026-05-31: disclosed: Vulnerability disclosed and CVE published.

## References

- [http://cdn2.v50to.cc/cgiSysTimeInfoSet_overflow.zip](http://cdn2.v50to.cc/cgiSysTimeInfoSet_overflow.zip)
- [https://vuldb.com/cve/CVE-2026-10189](https://vuldb.com/cve/CVE-2026-10189)
- [https://vuldb.com/submit/820021](https://vuldb.com/submit/820021)
- [https://vuldb.com/vuln/367470](https://vuldb.com/vuln/367470)
- [https://vuldb.com/vuln/367470/cti](https://vuldb.com/vuln/367470/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda W12 stack buffer overflow in set_local_time_0](https://junglewise.ai/threats/cve-2026-10192-tenda-w12-stack-buffer-overflow-in-set-local-time-0)
- [Tenda W12 stack overflow in cgiWifiMacFilterSet](https://junglewise.ai/threats/cve-2026-10191-tenda-w12-stack-overflow-in-cgiwifimacfilterset)
- [Tenda W12 denial of service in Web Management Interface](https://junglewise.ai/threats/cve-2026-10190-tenda-w12-denial-of-service-in-web-management-interface)
- [Tenda W12 stack buffer overflow in cgistaKickOff](https://junglewise.ai/threats/cve-2026-10188-tenda-w12-stack-buffer-overflow-in-cgistakickoff)
- [A vulnerability was found in Tenda W12 3.0.0.6(3948). The impacted element is the function wifiScheduledSet of the…](https://junglewise.ai/threats/cve-2025-11550-a-vulnerability-was-found-in-tenda-w12-3-0-0-6-3948-the-impacted)