Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-27511 is a clickjacking vulnerability found in the Shenzhen Tenda F3 Wireless Router firmware version 12.01.01.55_multi. The issue exists because the router's web-based administrative interface does not set the X-Frame-Options HTTP header."}, {'type': 'paragraph', 'content': "Without this header, attacker-controlled websites can embed the router's administrative pages inside an iframe and trick an authenticated administrator into performing unintended actions by clicking on hidden or disguised elements."}, {'type': 'paragraph', 'content': 'This can lead to unauthorized configuration changes on the router.'}] [2]

Useful 0 Not Useful 0

Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can impact you by allowing an attacker to manipulate the router's settings without your knowledge or consent."}, {'type': 'paragraph', 'content': "If an authenticated administrator is tricked into interacting with a malicious site embedding the router's admin interface, unauthorized configuration changes may be made."}, {'type': 'paragraph', 'content': 'Such changes could compromise the security or functionality of your network, potentially exposing it to further attacks or disruptions.'}] [2]

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by checking if the web-based administrative interface of the Shenzhen Tenda F3 Wireless Router firmware version 12.01.01.55_multi does not set the X-Frame-Options HTTP header.'}, {'type': 'paragraph', 'content': "One way to detect this is to send an HTTP request to the router's administrative interface and inspect the response headers for the presence or absence of the X-Frame-Options header."}, {'type': 'paragraph', 'content': 'For example, you can use the following command with curl to check the headers:'}, {'type': 'list_item', 'content': 'curl -I http://[router-ip-address]/'}, {'type': 'paragraph', 'content': 'If the X-Frame-Options header is missing in the response, the interface is vulnerable to clickjacking.'}] [2]

Useful 0 Not Useful 0

Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps include restricting access to the router's administrative interface to trusted networks and users only, to reduce the risk of an attacker exploiting the clickjacking vulnerability."}, {'type': 'paragraph', 'content': "Additionally, avoid visiting untrusted or suspicious websites while logged into the router's administrative interface, as these could attempt to exploit the vulnerability via malicious iframes."}, {'type': 'paragraph', 'content': 'If possible, update the router firmware to a version that addresses this vulnerability or contact the vendor for patches or configuration recommendations.'}] [2]

Useful 0 Not Useful 0