CVE-2025-15356
Unknown Unknown - Not Provided
Remote Buffer Overflow in Tenda AC20 PowerSaveSet Function

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: VulDB

Description
A vulnerability has been found in Tenda AC20 up to 16.03.08.12. The impacted element is the function sscanf of the file /goform/PowerSaveSet. The manipulation of the argument powerSavingEn/time/powerSaveDelay/ledCloseType leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
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Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-06-16
AI Q&A
2025-12-30
EPSS Evaluated
2026-06-14
NVD
CVE-2025-15356
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda ac20 16.03.08.12
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.
Attack-Flow Graph
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Executive Summary

This vulnerability is a buffer overflow issue in the Tenda AC20 router firmware (up to version 16.03.08.12) that occurs in the sscanf function within the /goform/PowerSaveSet endpoint. Specifically, when processing the parameters powerSavingEn, time, powerSaveDelay, and ledCloseType, the input is not properly validated against the buffer size, allowing an attacker to overflow the buffer. This flaw can be exploited remotely by sending a specially crafted HTTP POST request, potentially leading to denial of service or remote code execution on the device. [3, 4]

Impact Analysis

Exploitation of this vulnerability can lead to denial of service (DoS), causing the device to crash or become unresponsive, or remote code execution (RCE), allowing an attacker to execute arbitrary code on the affected router. This compromises the confidentiality, integrity, and availability of the device, potentially allowing attackers to control the router, intercept or manipulate network traffic, or disrupt network services. [3, 4]

Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests to the endpoint /goform/PowerSaveSet containing the parameters powerSavingEn, time, powerSaveDelay, and ledCloseType with unusually large or malformed values that could trigger the buffer overflow. Since a proof-of-concept exploit is publicly available on GitHub, you can use or adapt those scripts to test your system. Specific commands would involve sending crafted HTTP POST requests to the vulnerable endpoint and observing the device's response or crash behavior. However, no exact detection commands are provided in the resources. [1, 2, 3, 4]

Mitigation Strategies

Immediate mitigation steps include replacing the affected Tenda AC20 device or firmware version (up to 16.03.08.12) with a non-vulnerable version or alternative device, as no official patches or fixes have been reported. Additionally, restricting remote access to the device, disabling remote management if possible, and monitoring network traffic for exploitation attempts can help reduce risk. Since the exploit is remotely executable without authentication and no known mitigations exist, device replacement is strongly recommended. [4]

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