CVE-2025-12258
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-27

Last updated on: 2025-10-28

Assigner: VulDB

Description
A vulnerability was detected in TOTOLINK A3300R 17.0.0cu.557_B20221024. Impacted is the function setOpModeCfg of the file /cgi-bin/cstecgi.cg of the component POST Parameter Handler. The manipulation of the argument opmode results in stack-based buffer overflow. The attack may be performed from remote.
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Meta Information
Published
2025-10-27
Last Modified
2025-10-28
Generated
2026-06-16
AI Q&A
2025-10-27
EPSS Evaluated
2026-06-15
NVD
CVE-2025-12258
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
totolink a3300r_firmware 17.0.0cu.557_b20221024
totolink a3300r *
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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-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability exists in the TOTOLINK A3300R router firmware version 17.0.0cu.557_B20221024, specifically in the setOpModeCfg function of the /cgi-bin/cstecgi.cg file. It involves a stack-based buffer overflow caused by improper handling of the 'opmode' parameter in a POST request. An attacker can exploit this remotely by manipulating this parameter to overflow the buffer, potentially leading to arbitrary code execution or system compromise.

Impact Analysis

Exploitation of this vulnerability can allow a remote attacker to execute arbitrary code on the affected device, potentially leading to full control over the router. This can result in disruption of network services, interception or manipulation of network traffic, and compromise of connected devices.

Detection Guidance

This vulnerability can be detected by monitoring for HTTP POST requests to the /cgi-bin/cstecgi.cg endpoint with the parameter 'opmode' being manipulated. You can use network traffic analysis tools like tcpdump or Wireshark to capture such requests. For example, a command to capture relevant HTTP POST requests might be: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'POST /cgi-bin/cstecgi.cg'. Additionally, you can use curl or similar tools to test the endpoint manually by sending crafted POST requests with various 'opmode' values to check for abnormal responses or crashes. [1]

Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /cgi-bin/cstecgi.cg, especially blocking remote POST requests that manipulate the 'opmode' parameter. Applying network-level filtering or firewall rules to limit access to trusted IPs can help. Additionally, updating the device firmware to a version that patches this vulnerability is recommended once available. If an update is not yet available, disabling the affected service or function temporarily may reduce risk. [1]

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