CVE-2025-9779
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-2025-9779 is a buffer overflow vulnerability in the TOTOLINK A702R router firmware version 4.0.0-B20211108.1423. It occurs in the function sub_4162DC within the /boafrm/formFilter endpoint, specifically 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 may cause the router's program to crash or be compromised. [1, 2]
How can this vulnerability impact me? :
This vulnerability can be exploited remotely by attackers to cause a buffer overflow, potentially leading to a crash of the router's program or full compromise of the device. This can affect the confidentiality, integrity, and availability of the router, allowing attackers to disrupt network services or gain unauthorized control over the device. The attack complexity is low, and a public exploit exists, making it a significant security risk. [1, 2]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring requests to the /boafrm/formFilter endpoint, specifically looking for abnormal or oversized inputs in the ip6addr argument that could trigger a buffer overflow. Since the exploit is public and targets this endpoint remotely, network traffic analysis tools or intrusion detection systems (IDS) can be configured to alert on suspicious POST or GET requests to /boafrm/formFilter containing unusually large or malformed ip6addr parameters. Specific commands are not provided in the resources, but using tools like curl or wget to test the endpoint with oversized ip6addr values could help verify vulnerability presence. [1, 2]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include replacing the affected TOTOLINK A702R router running firmware version 4.0.0-B20211108.1423 with a non-vulnerable device or firmware version, as no known countermeasures or patches are currently available. Additionally, restricting remote access to the /boafrm/formFilter endpoint via firewall rules or network segmentation can reduce exposure. Monitoring for exploit attempts and disabling unnecessary services on the router may also help reduce risk until a fix is available. [2]