CVE-2025-9246
Published: 20 August 2025
Summary
CVE-2025-9246 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Linksys Re6250 Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 44.5% 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires validation of inputs like single_port_rule and port_range_rule to prevent stack-based buffer overflows from improper restriction of operations within memory bounds.
Implements memory protection mechanisms such as stack canaries, ASLR, and DEP to mitigate exploitation of stack-based buffer overflows even if input validation fails.
Mandates timely remediation of identified flaws like this buffer overflow through firmware updates or patches for affected Linksys range extenders.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the web endpoint /goform/check_port_conflict, exploitable remotely via crafted single_port_rule/port_range_rule parameters, enables remote code execution on the Linksys range extender's public-facing management interface.
NVD Description
A flaw has been found in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001. Impacted is the function check_port_conflict of the file /goform/check_port_conflict. Executing manipulation of the argument single_port_rule/port_range_rule can lead to stack-based buffer overflow. The attack can be…
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executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Deeper analysisAI
CVE-2025-9246 is a stack-based buffer overflow vulnerability affecting the check_port_conflict function in the file /goform/check_port_conflict on Linksys range extenders, specifically models RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. The flaw impacts firmware versions 1.0.013.001, 1.0.04.001, 1.0.04.002, 1.1.05.003, and 1.2.07.001. It stems from improper handling of the single_port_rule or port_range_rule arguments and is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow).
The vulnerability enables remote exploitation by an attacker with low privileges (PR:L) over the network (AV:N) with low complexity (AC:L) and no user interaction (UI:N). Successful exploitation can result in high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H), as reflected in its CVSS v3.1 base score of 8.8, potentially allowing arbitrary code execution or system compromise in an unscoped impact (S:U) scenario.
Advisories from VulDB and a GitHub repository detail the issue, including a published exploit that may be used by attackers. The vendor, Linksys, was contacted early for disclosure but provided no response, and no patches or mitigations are referenced in the available sources.
Notable context includes the public availability of the exploit, increasing the risk of active exploitation against unpatched devices.
Details
- CWE(s)