CVE-2025-9781
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-2025-9781 is a critical buffer overflow vulnerability in the TOTOLINK A702R router (version 4.0.0-B20211108.1423). It occurs in the function sub_4162DC within the file /boafrm/formFilter due to improper handling of the argument "ip6addr". The input buffer is copied to an output buffer without checking if the input size fits, causing a buffer overflow. This flaw can be exploited remotely and allows attackers to compromise the device. [1]
How can this vulnerability impact me? :
This vulnerability can be exploited remotely to compromise the confidentiality, integrity, and availability of the affected TOTOLINK A702R router. An attacker could potentially execute arbitrary code, cause denial of service, or gain unauthorized access to the device, leading to disruption of network services or data breaches. [1]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
The vulnerability arises from a buffer overflow in the /boafrm/formFilter file's sub_4162DC function when handling the ip6addr argument. Detection can involve monitoring for unusual or malformed HTTP requests targeting /boafrm/formFilter with suspicious ip6addr parameters. Since a proof-of-concept exploit is publicly available, you can use network traffic inspection tools like tcpdump or Wireshark to capture and analyze HTTP requests to the router. Additionally, using curl or wget to send crafted requests to /boafrm/formFilter with oversized ip6addr parameters can help test if the device is vulnerable. Example command to test manually: curl -v --data "ip6addr=$(python3 -c 'print("A"*1000)')" http://<router-ip>/boafrm/formFilter [1]
What immediate steps should I take to mitigate this vulnerability?
No known countermeasures or mitigations have been identified for this vulnerability. The recommended immediate step is to replace the affected TOTOLINK A702R device with an alternative product. Until replacement, limit remote access to the device and monitor for exploit attempts to reduce risk. [1]