CVE-2025-9525
Published: 27 August 2025
Summary
CVE-2025-9525 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Linksys E1700 Firmware. Its CVSS base score is 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 31.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2025-9525 is a stack-based buffer overflow vulnerability affecting the Linksys E1700 router on firmware version 1.0.0.4.003. The issue lies in the setWan function of the /goform/setWan file, where manipulation of the DeviceName or lanIp arguments triggers the overflow. It maps to CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow), and was published on 2025-08-27 with a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
The vulnerability enables remote exploitation by attackers possessing low privileges, such as authenticated users on the network. With low attack complexity and no need for user interaction, exploitation can lead to high impacts on confidentiality, integrity, and availability, potentially allowing arbitrary code execution or denial of service on the affected device.
Advisories from VulDB indicate that the vendor was contacted early regarding disclosure but provided no response or patches. A proof-of-concept exploit has been publicly released on GitHub, increasing the risk of active exploitation.
The published exploit may facilitate real-world attacks against unpatched Linksys E1700 devices running the vulnerable firmware.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25878
Vulnerability details
A flaw has been found in Linksys E1700 1.0.0.4.003. Affected by this vulnerability is the function setWan of the file /goform/setWan. This manipulation of the argument DeviceName/lanIp causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has…
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been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the remote web management interface (/goform/setWan) enables remote exploitation of a public-facing application on the Linksys E1700 router.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents stack-based buffer overflows by enforcing validation of DeviceName and lanIp inputs to the setWan function.
Implements memory protections like stack canaries and ASLR to mitigate exploitation of the stack buffer overflow vulnerability.
Requires timely remediation of the disclosed buffer overflow flaw through patching or replacement of vulnerable firmware.