CVE-2025-14656
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-14

Last updated on: 2026-02-24

Assigner: VulDB

Description
A weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
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Meta Information
Published
2025-12-14
Last Modified
2026-02-24
Generated
2026-06-16
AI Q&A
2025-12-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-14656
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
tenda ac20_firmware 16.03.08.12
tenda ac20 *
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-2025-14656 is a critical buffer overflow vulnerability in the Tenda AC20 router version 16.03.08.12. It affects the httpd service at the /goform/openSchedWifi endpoint, where improper handling of the schedStartTime and schedEndTime parameters allows an attacker to overflow a buffer by sending oversized input. This can be exploited remotely without authentication, potentially compromising the device's confidentiality, integrity, and availability. Public exploit code is available, and no mitigations are currently known. [1, 3]

Impact Analysis

This vulnerability can lead to a denial-of-service (DoS) condition or potentially allow remote command execution on the affected Tenda AC20 router. Exploiting it can compromise the device's confidentiality, integrity, and availability, allowing attackers to disrupt network services or take control of the device remotely. Since the exploit is publicly available and no mitigations exist, the risk is significant. [1, 3]

Detection Guidance

This vulnerability can be detected by monitoring HTTP requests to the /goform/openSchedWifi endpoint on Tenda AC20 routers running firmware version 16.03.08.12, specifically looking for suspicious or malformed schedStartTime and schedEndTime parameters that could trigger a buffer overflow. Since the exploit is publicly available, you can use network traffic inspection tools like tcpdump or Wireshark to capture and analyze such requests. For example, you could use a command like: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/openSchedWifi' to filter HTTP requests to the vulnerable endpoint. Additionally, checking router logs for unusual activity or crashes related to the httpd service may help detect exploitation attempts. [1]

Mitigation Strategies

There are no known mitigations or countermeasures currently available for this vulnerability. The recommended immediate step is to replace the affected Tenda AC20 router running firmware version 16.03.08.12 with an alternative device or firmware version that is not vulnerable. Additionally, restricting remote access to the router's management interface and monitoring network traffic for exploitation attempts can help reduce risk until a patch or fix is available. [1]

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