# CVE-2026-52189: UTT nv518G buffer overflow in gohead/sub_487330

Source: https://junglewise.ai/threats/cve-2026-52189-utt-nv518g-buffer-overflow-in-gohead-sub-487330  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-02. Updated: 2026-07-02  
License: CC BY 4.0 with a link back

CVE-2026-52189 · Severity: info · CVSS 5.3 · Published 2026-07-02

A security vulnerability exists in UTT nv518G enterprise routers that could allow a remote attacker to crash the device. By sending a specially crafted web request, an attacker can trigger a buffer overflow, leading to a denial of service. This can disrupt internet connectivity and business operations for organizations relying on these routers.

Technologies: [UTT NV518G](https://junglewise.ai/threats/technologies/nv518g). Vendors: [UTT](https://junglewise.ai/threats/vendors/utt).

## Quick answers

**Is CVE-2026-52189 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-52189 being exploited in the wild.

**How severe is CVE-2026-52189?** Informational severity, with a CVSS score of 5.3, published 2 July 2026.

**Which products and versions are affected?** UTT NV518G nv518GV3v3.2.7-210919-161313.

**Is there a fix for CVE-2026-52189?** 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-2026-52189 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-52189?** Check whether you run UTT NV518G 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 GoAhead web server component of UTT nv518G routers, specifically within the function sub_487330. The vulnerability is caused by a lack of length validation on the 'indexIDNew' parameter provided in a POST request. A remote, unauthenticated attacker can exploit this by sending an excessively long string in the 'indexIDNew' variable, overwriting adjacent memory on the stack. Successful exploitation results in a crash of the web service or the entire device, leading to a denial of service (DoS).

## Affected products

- UTT nv518G firmware nv518GV3v3.2.7-210919-161313

## Timeline

- 2026-07-02: advisory: CVE-2026-52189 published by NVD

## References

- [https://github.com/akuma-QAQ/CVEreport/blob/main/518G/FUN_00487330/README.md](https://github.com/akuma-QAQ/CVEreport/blob/main/518G/FUN_00487330/README.md)
- [https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn](https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn)

## Related threats

- [UTT nv518G command injection in gohead/sub_445C5C](https://junglewise.ai/threats/cve-2026-52192-utt-nv518g-command-injection-in-gohead-sub-445c5c)
- [UTT nv518G Buffer Overflow in gohead/sub_444C8C](https://junglewise.ai/threats/cve-2026-52191-utt-nv518g-buffer-overflow-in-gohead-sub-444c8c)
- [UTT nv518G buffer overflow in gohead component](https://junglewise.ai/threats/cve-2026-52188-utt-nv518g-buffer-overflow-in-gohead-component)
- [UTT nv518G buffer overflow in GoAhead sub_483ba0](https://junglewise.ai/threats/cve-2026-52187-utt-nv518g-buffer-overflow-in-goahead-sub-483ba0)
- [UTT nv518G buffer overflow in gohead/sub_448384](https://junglewise.ai/threats/cve-2026-52190-utt-nv518g-buffer-overflow-in-gohead-sub-448384)