CVE-2025-9526
Published: 27 August 2025
Summary
CVE-2025-9526 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 26.3% 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-2025-9526 is a stack-based buffer overflow vulnerability (CWE-119, CWE-121) in the Linksys E1700 router running firmware version 1.0.0.4.003. The flaw affects the setSysAdm function in the /goform/setSysAdm file, where manipulation of the rm_port argument triggers the overflow.
The vulnerability enables remote exploitation by attackers with low privileges (PR:L) over the network (AV:N), requiring low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation results in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H), as reflected in its CVSS v3.1 base score of 8.8, potentially allowing full compromise of the device.
Advisories from VulDB (CTI ID 321543, submission 634825) and GitHub repositories detail the vulnerability, including a proof-of-concept exploit. The vendor was contacted early but provided no response, and no patches or official mitigations are available.
The exploit has been publicly disclosed and may be used in attacks against unpatched Linksys E1700 devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25877
Vulnerability details
A vulnerability has been found in Linksys E1700 1.0.0.4.003. Affected by this issue is the function setSysAdm of the file /goform/setSysAdm. Such manipulation of the argument rm_port leads to stack-based buffer overflow. The attack can be launched remotely. The exploit…
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has been disclosed to the public 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 web management interface (/goform/setSysAdm) via remote manipulation of rm_port enables remote code execution on the Linksys E1700 router, facilitating exploitation of a public-facing application.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-10 requires validation of inputs like the rm_port argument to prevent stack-based buffer overflows from malformed data.
SI-16 implements memory protections such as stack canaries and ASLR to mitigate exploitation of stack buffer overflows even if invalid input reaches the vulnerable function.
SI-2 mandates timely remediation of disclosed flaws like CVE-2025-9526 through patching, firmware updates, or device replacement.