Tenda F456 Router: Remote Buffer Overflow (CVE-2026-7056) Public Exploit
A critical buffer overflow vulnerability, identified as CVE-2026-7056, has been reported in the Tenda F456 router, version 1.0.0.5. According to the National Vulnerability Database, this flaw resides in the fromSafeUrlFilter function within the /goform/SafeUrlFilter component of the httpd service. Manipulation of the page argument can lead to the overflow.
The National Vulnerability Database highlights that this vulnerability carries a CVSSv3.1 score of 8.8 (High severity), indicating a significant risk. The attack can be performed remotely, and crucially, a public exploit is now available. This drastically lowers the barrier for attackers, making exploitation highly probable for unpatched devices.
For defenders, this means any Tenda F456 routers on your network are now exposed to remote compromise. Attackers can leverage this to gain control, disrupt services, or pivot deeper into the network. Given the public exploit, this isn’t a theoretical threat; it’s an immediate operational risk that needs urgent attention.
What This Means For You
- If your network includes Tenda F456 routers, specifically version 1.0.0.5, you are directly exposed to CVE-2026-7056. A public exploit exists. Isolate or remove these devices immediately if a patch is not available. Assume compromise if these devices are internet-facing and unpatched.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 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.
CVE-2026-7056 - Tenda F456 Router Remote Buffer Overflow
title: CVE-2026-7056 - Tenda F456 Router Remote Buffer Overflow
id: scw-2026-04-26-ai-1
status: experimental
level: critical
description: |
Detects exploitation attempts against the Tenda F456 router by looking for requests to the '/goform/SafeUrlFilter' endpoint with a 'page=' parameter, which is the vulnerable function in CVE-2026-7056. This indicates a potential buffer overflow attack.
author: SCW Feed Engine (AI-generated)
date: 2026-04-26
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7056/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/goform/SafeUrlFilter'
cs-uri-query|contains:
- 'page='
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7056 | Buffer Overflow | Tenda F456 version 1.0.0.5 |
| CVE-2026-7056 | Buffer Overflow | Vulnerable component: httpd |
| CVE-2026-7056 | Buffer Overflow | Vulnerable file: /goform/SafeUrlFilter |
| CVE-2026-7056 | Buffer Overflow | Vulnerable function: fromSafeUrlFilter |
| CVE-2026-7056 | Buffer Overflow | Manipulation of argument: page |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 27, 2026 at 01:17 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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