# CVE-2026-18895: UTT HiPER 1250GW stack buffer overflow in APSecurity_5g

Source: https://junglewise.ai/threats/cve-2026-18895-utt-hiper-1250gw-stack-buffer-overflow-in-apsecurity-5g  
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-2026-18895 · Severity: high · CVSS 8.8 · Published 2026-08-05

The UTT HiPER 1250GW is a network router commonly used in small business environments. A vulnerability in its web-based administration interface allows remote attackers to trigger a stack-based buffer overflow by sending a specially crafted request with an oversized "cipher" parameter. This can cause the router to crash or stop functioning, disrupting network connectivity for all users relying on it.

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

## Quick answers

**Is CVE-2026-18895 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18895 being exploited in the wild.

**How severe is CVE-2026-18895?** High severity, with a CVSS score of 8.8, published 5 August 2026.

**Which products and versions are affected?** UTT HiPER 1250GW up to 3.2.7-210907-180535.

**Is there a fix for CVE-2026-18895?** 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-2026-18895 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-18895?** 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

A stack-based buffer overflow vulnerability exists in the /goform/APSecurity_5g endpoint due to improper use of strcpy() in the cipher parameter handling. The vulnerable code copies user-supplied input directly to a fixed-size stack buffer without length validation. An unauthenticated remote attacker can exploit this over the network by sending an HTTP POST request with an oversized cipher parameter (as demonstrated in the public proof-of-concept). Successful exploitation can result in denial of service through application crash; remote code execution may be possible depending on stack layout and protections. The vendor was contacted early but did not respond with patches.

## Affected products

- UTT HiPER 1250GW up to 3.2.7-210907-180535

## Timeline

- 2026-08-05: disclosed: Public disclosure via GitHub repository
- 2026-08-05: other: Exploit code made public in repository

## References

- [https://github.com/7wkajk/CVE-VUL/blob/main/101.md](https://github.com/7wkajk/CVE-VUL/blob/main/101.md)
- [https://vuldb.com/cve/CVE-2026-18895](https://vuldb.com/cve/CVE-2026-18895)

## 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 getOneApConfTempEntry](https://junglewise.ai/threats/cve-2026-18897-utt-hiper-1250gw-stack-buffer-overflow-in-getoneapconftempentry)
- [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)