CVE-2025-9779
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-01

Last updated on: 2025-09-04

Assigner: VulDB

Description
A vulnerability was detected in TOTOLINK A702R 4.0.0-B20211108.1423. Affected by this vulnerability is the function sub_4162DC of the file /boafrm/formFilter. The manipulation of the argument ip6addr results in buffer overflow. It is possible to launch the attack remotely. The exploit is now public and may be used.
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Meta Information
Published
2025-09-01
Last Modified
2025-09-04
Generated
2026-06-16
AI Q&A
2025-09-01
EPSS Evaluated
2026-06-14
NVD
CVE-2025-9779
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
totolink a702r_firmware 4.0.0-b20211108.1423
totolink a702r *
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

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]

Impact Analysis

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]

Detection Guidance

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]

Mitigation Strategies

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]

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