# CVE-2026-18897: UTT HiPER 1250GW stack buffer overflow in getOneApConfTempEntry

Source: https://junglewise.ai/threats/cve-2026-18897-utt-hiper-1250gw-stack-buffer-overflow-in-getoneapconftempentry  
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-2026-18897 · Severity: high · CVSS 8.8 · Published 2026-08-05

The UTT HiPER 1250GW is a network router used to manage internet connectivity and network traffic in enterprise and small business environments. A critical vulnerability in its web-based configuration interface allows remote attackers to send a specially crafted request with an oversized parameter, causing the router to crash or potentially execute arbitrary code. This could result in network unavailability, data loss, or unauthorized access to network management functions.

Technologies: [UTT HiPER 1250GW](https://junglewise.ai/threats/technologies/hiper-1250gw). Vendors: [UTT](https://junglewise.ai/threats/vendors/utt).

## Quick answers

**Is CVE-2026-18897 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18897 being exploited in the wild.

**How severe is CVE-2026-18897?** High severity, with a CVSS score of 8.8, published 5 August 2026.

**Which products and versions are affected?** UTT HiPER 1250GW up to v3.2.7-210907-180535.

**Is there a fix for CVE-2026-18897?** 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-2026-18897 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-18897?** Check whether you run UTT HiPER 1250GW 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 /goform/getOneApConfTempEntry endpoint, triggered by the tempName parameter passed to an unsafe strcpy() function. The vulnerable code does not validate the length of user-supplied input before copying it into a fixed-size stack buffer, allowing an attacker to overflow the buffer with arbitrary data. An attacker with network access to the router's web interface (typically requiring authentication via Digest auth, though the advisory indicates remote exploitation) can trigger a denial of service by crashing the device, or potentially achieve code execution by carefully crafting a payload with a return address. A public exploit is available and the vendor has not responded to disclosure attempts.

## Affected products

- UTT HiPER 1250GW up to v3.2.7-210907-180535

## Timeline

- 2026-08-05: disclosed: Vulnerability published on NVD
- 2026-08-05: other: Vendor was contacted early but did not respond

## References

- [https://github.com/7wkajk/CVE-VUL/blob/main/102.md](https://github.com/7wkajk/CVE-VUL/blob/main/102.md)
- [https://vuldb.com/cve/CVE-2026-18897](https://vuldb.com/cve/CVE-2026-18897)

## Related threats

- [UTT HiPER 1250GW stack buffer overflow in HTTP request handler](https://junglewise.ai/threats/cve-2026-78169-utt-hiper-1250gw-stack-buffer-overflow-in-http-request-handler)
- [UTT HiPER 1250GW stack buffer overflow in APSecurity_5g](https://junglewise.ai/threats/cve-2026-18895-utt-hiper-1250gw-stack-buffer-overflow-in-apsecurity-5g)
- [UTT HiPER 1250GW stack overflow in ConfigWirelessBase_5g](https://junglewise.ai/threats/cve-2026-14721-utt-hiper-1250gw-stack-overflow-in-configwirelessbase-5g)
- [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 1250GW stack overflow in formGroupConfig](https://junglewise.ai/threats/cve-2026-9632-utt-hiper-1250gw-stack-overflow-in-formgroupconfig)