CVE-2025-9783
BaseFortify
Publication date: 2025-09-01
Last updated on: 2025-09-04
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| totolink | a702r_firmware | 4.0.0-b20211108.1423 |
| totolink | a702r | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| 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. |
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-9783 is a buffer overflow vulnerability in the TOTOLINK A702R router firmware version 4.0.0-B20211108.1423. It occurs in the function sub_418030 within the /boafrm/formParentControl endpoint, specifically due to improper handling of the 'submit-url' argument. This allows an attacker to send input that exceeds the buffer size, causing a buffer overflow which can crash the router or lead to further exploitation. The vulnerability can be exploited remotely without authentication, and proof-of-concept exploits are publicly available. [1, 2]
How can this vulnerability impact me? :
This vulnerability can allow remote attackers to compromise the TOTOLINK A702R router without authentication. Exploiting the buffer overflow can lead to denial of service by crashing the device, and potentially allow attackers to execute arbitrary code, compromising the confidentiality, integrity, and availability of the system. Due to the critical severity and ease of exploitation, it poses a significant security risk to affected users. [1, 2]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
Detection can be performed by monitoring network traffic for requests to the /boafrm/formParentControl endpoint with the submit-url argument, which is exploited in this vulnerability. Since a proof-of-concept exploit is publicly available, security teams can use it to test if the device is vulnerable. Specific commands are not provided in the resources, but network monitoring tools like tcpdump or Wireshark can be used to capture HTTP requests targeting the vulnerable endpoint. For example, using tcpdump: tcpdump -i <interface> 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' and then filtering for /boafrm/formParentControl in the HTTP payload. Additionally, vulnerability scanners or custom scripts leveraging the public proof-of-concept exploit can be used to detect the vulnerability. [1, 2]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include replacing the affected TOTOLINK A702R device with an alternative product, as no known countermeasures or patches are currently available. Network administrators should restrict access to the device's management interface, especially blocking remote access to the /boafrm/formParentControl endpoint. Implementing network segmentation and firewall rules to limit exposure can reduce risk. Monitoring for exploit attempts and applying intrusion detection/prevention systems targeting this vulnerability is also advised. [2]