Tenda F456 Router Buffer Overflow (CVE-2026-7101) Allows Remote Exploitation
The National Vulnerability Database (NVD) has disclosed CVE-2026-7101, a high-severity buffer overflow vulnerability impacting Tenda F456 1.0.0.5 routers. Specifically, the flaw resides in the fromWrlclientSet function within the /goform/WrlclientSet component of the httpd service.
This vulnerability, with a CVSSv3.1 score of 8.8 (High), allows for remote exploitation. An attacker can manipulate the affected function to trigger the buffer overflow, potentially leading to arbitrary code execution or denial of service. The NVD notes that exploit details have been publicly disclosed, increasing the urgency for defenders.
While specific affected products beyond the Tenda F456 1.0.0.5 are not detailed, the nature of remote exploitation on an internet-facing device like a router makes this a critical concern. CISOs should assume these devices are exposed and prioritize mitigation.
What This Means For You
- If your organization or remote workforce uses Tenda F456 1.0.0.5 routers, you are directly exposed to remote exploitation. Given the public disclosure of exploit details, attackers are likely already probing for vulnerable devices. Isolate or replace these routers immediately. If replacement isn't feasible, ensure they are not directly internet-facing and are behind a robust firewall with strict access controls. Patching should be the absolute priority if a fix becomes available.
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-2026-7101
title: Web Application Exploitation Attempt — CVE-2026-7101
id: scw-2026-04-27-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7101 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-04-27
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7101/
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-2026-7101
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7101 | Vulnerability | CVE-2026-7101 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 12:16 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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