CVE-2026-7420: UTT HiPER 1250GW Buffer Overflow Exploitable Remotely
The National Vulnerability Database has disclosed CVE-2026-7420, a critical buffer overflow vulnerability affecting UTT HiPER 1250GW devices running firmware up to version 3.2.7-210907-180535. This flaw resides in the strcpy function within the route/goform/ConfigAdvideo file, specifically when handling the Profile argument. A remote attacker can manipulate this argument to trigger the buffer overflow.
Rated with a CVSSv3.1 score of 8.8 (High), this vulnerability presents a severe risk. Its network-adjacent attack vector and low privileges required mean an attacker can achieve high impact on confidentiality, integrity, and availability. Crucially, public exploit code is already available, significantly lowering the bar for attackers and increasing the likelihood of widespread exploitation.
This isn’t just theoretical. Public exploits turn vulnerabilities into active threats overnight. Defenders need to assume compromise if they’re running unpatched UTT HiPER 1250GW devices. The attacker’s calculus here is simple: find unpatched devices, run the exploit, gain control. It’s a low-effort, high-reward scenario that will be quickly adopted by opportunistic actors.
What This Means For You
- If your organization uses UTT HiPER 1250GW devices, immediately check their firmware versions. Any device running version 3.2.7-210907-180535 or older is directly exposed to CVE-2026-7420. Patching is the only viable defense here; assume public exploit availability means active targeting.
Related ATT&CK Techniques
🛡️ Detection Rules
5 rules · 6 SIEM formats5 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Web Application Exploitation Attempt — CVE-2026-7420
title: Web Application Exploitation Attempt — CVE-2026-7420
id: scw-2026-04-29-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7420 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-04-29
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7420/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '..'
- 'SELECT'
- 'UNION'
- '<script'
- 'cmd='
- '/etc/passwd'
condition: selection
falsepositives:
- Legitimate activity from CVE-2026-7420
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7420 | Buffer Overflow | UTT HiPER 1250GW up to 3.2.7-210907-180535 |
| CVE-2026-7420 | Buffer Overflow | Vulnerable function: strcpy in route/goform/ConfigAdvideo |
| CVE-2026-7420 | Buffer Overflow | Vulnerable argument: Profile |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 30, 2026 at 02:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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