# CVE-2026-18898: UTT HiPER 1200GW stack buffer overflow in ConfigAdvideo

Source: https://junglewise.ai/threats/cve-2026-18898-utt-hiper-1200gw-stack-buffer-overflow-in-configadvideo  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-05. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-18898 · Severity: high · CVSS 8.8 · Published 2026-08-05

The UTT HiPER 1200GW is a network router used to manage and route corporate or small office traffic. A stack buffer overflow vulnerability in its web administration interface allows an attacker to send a specially crafted request to the /goform/ConfigAdvideo endpoint, potentially crashing the device or executing arbitrary code. This could result in loss of network connectivity, data interception, or complete device compromise.

Technologies: [UTT HiPER 1200GW](https://junglewise.ai/threats/technologies/hiper-1200gw). Vendors: [UTT](https://junglewise.ai/threats/vendors/utt).

## Quick answers

**Is CVE-2026-18898 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18898 being exploited in the wild.

**How severe is CVE-2026-18898?** High severity, with a CVSS score of 8.8, published 5 August 2026.

**Which products and versions are affected?** UTT HiPER 1200GW up to v2.5.3-170306.

**Is there a fix for CVE-2026-18898?** 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-2026-18898 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-18898?** Check whether you run UTT HiPER 1200GW 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 vulnerability is a stack-based buffer overflow in the ConfigAdvideo web form handler, specifically within the strcpy() function used to process the "timestart" parameter. The vulnerable code lacks proper boundary checking when copying user-supplied input into a fixed-size stack buffer. An attacker can send a POST request to /goform/ConfigAdvideo with an oversized "timestart" parameter to trigger the overflow. Authentication may be required depending on device configuration. Successful exploitation allows denial of service or remote code execution with device privileges.

## Affected products

- UTT HiPER 1200GW up to v2.5.3-170306

## Timeline

- 2026-08-05: disclosed
- other: Exploit released to public

## References

- [https://github.com/7wkajk/CVE-VUL/blob/main/103.md](https://github.com/7wkajk/CVE-VUL/blob/main/103.md)
- [https://vuldb.com/cve/CVE-2026-18898](https://vuldb.com/cve/CVE-2026-18898)

## Related threats

- [UTT HiPER 1200GW buffer overflow in formConfigFastDirectionW](https://junglewise.ai/threats/cve-2026-78170-utt-hiper-1200gw-buffer-overflow-in-formconfigfastdirectionw)
- [UTT HiPER Router stack buffer overflow in formFireWall](https://junglewise.ai/threats/cve-2026-10293-utt-hiper-router-stack-buffer-overflow-in-formfirewall)
- [UTT HiPER 1200GW stack buffer overflow in /goform/formTaskEdit](https://junglewise.ai/threats/cve-2026-10292-utt-hiper-1200gw-stack-buffer-overflow-in-goform-formtaskedit)
- [UTT HiPER 1200GW stack overflow in formPptpClientConfig](https://junglewise.ai/threats/cve-2026-9628-utt-hiper-1200gw-stack-overflow-in-formpptpclientconfig)
- [UTT HiPER 1200GW buffer overflow in Web Management Interface](https://junglewise.ai/threats/cve-2026-9627-utt-hiper-1200gw-buffer-overflow-in-web-management-interface)