CVE-2026-2139
Remote Buffer Overflow in Tenda TX9 WiFi Settings Function
Publication date: 2026-02-08
Last updated on: 2026-02-10
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| tenda | tx9_firmware | to 22.03.02.10 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': "CVE-2026-2139 is a buffer overflow vulnerability found in the Tenda TX9 router running firmware version 22.03.02.10_multi. It occurs in the function sub_432580 within the file /goform/fast_setting_wifi_set. The vulnerability is triggered by manipulating the 'ssid' argument, which is improperly handled and causes a buffer overflow condition."}, {'type': 'paragraph', 'content': 'This flaw allows remote attackers to exploit the vulnerability without requiring local access, making it possible to initiate an attack over the network. The exploit details have been publicly disclosed, increasing the risk of exploitation.'}] [1, 2]
How can this vulnerability impact me? :
This vulnerability can severely impact the affected device by compromising its confidentiality, integrity, and availability. Because it is a buffer overflow, an attacker can potentially execute arbitrary code remotely, leading to unauthorized control over the device.
Exploitation does not require local access or physical interaction, making it easier for attackers to target the device remotely. The publicly available exploit increases the likelihood of attacks.
There are no known mitigations or countermeasures reported, so the recommended action is to replace the affected product with an alternative to avoid risk.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring HTTP requests to the endpoint /goform/fast_setting_wifi_set on Tenda TX9 routers running firmware up to version 22.03.02.10_multi. Specifically, detection involves identifying suspicious or malformed requests manipulating the ssid parameter, which triggers the buffer overflow.'}, {'type': 'paragraph', 'content': 'Network administrators can use packet capture tools like tcpdump or Wireshark to filter and analyze HTTP traffic targeting the vulnerable endpoint.'}, {'type': 'list_item', 'content': "Use tcpdump to capture HTTP requests to the vulnerable path: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/fast_setting_wifi_set'"}, {'type': 'list_item', 'content': 'Use curl or similar tools to test the endpoint manually by sending crafted requests with varying ssid parameter lengths to check for abnormal responses or crashes.'}, {'type': 'paragraph', 'content': 'Since the exploit is publicly disclosed, IDS/IPS signatures may exist to detect attempts exploiting this buffer overflow by matching known payload patterns targeting the ssid parameter.'}] [1, 2]
What immediate steps should I take to mitigate this vulnerability?
[{'type': 'paragraph', 'content': "Immediate mitigation steps include restricting access to the vulnerable router's management interface, especially blocking remote HTTP access to the /goform/fast_setting_wifi_set endpoint."}, {'type': 'paragraph', 'content': 'Since no known mitigations or patches are reported, it is strongly recommended to replace the affected Tenda TX9 router firmware version 22.03.02.10_multi with a secure alternative or updated firmware once available.'}, {'type': 'paragraph', 'content': 'Additionally, monitoring network traffic for exploitation attempts and applying network-level protections such as firewall rules to block suspicious requests targeting the vulnerable endpoint can reduce risk.'}] [2]