CVE-2025-9358
Published: 23 August 2025
Summary
CVE-2025-9358 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 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-2025-9358 is a stack-based buffer overflow vulnerability in the setSysAdm function within the /goform/setSysAdm file of Linksys Wi-Fi range extenders, specifically models RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 running firmware versions 1.0.013.001, 1.0.04.001, 1.0.04.002, 1.1.05.003, or 1.2.07.001. The flaw arises from improper handling of the admpasshint argument, allowing overflow conditions (CWE-119, CWE-121). It carries 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), indicating high severity due to its potential for remote exploitation.
Attackers with low privileges (PR:L), such as authenticated users, can exploit this remotely over the network with low complexity and no user interaction required. Successful exploitation enables arbitrary code execution, potentially granting high-impact confidentiality, integrity, and availability compromises, including full device takeover. A proof-of-concept exploit is publicly available, increasing the risk of widespread abuse.
VulDB advisories (ctiid.321061, id.321061) and GitHub repositories detail the vulnerability, including a POC, but no vendor patches or mitigations are referenced. The vendor was notified early but provided no response, leaving affected devices without official remediation. Security practitioners should isolate or decommission vulnerable extenders where possible.
The exploit's public release heightens immediate risks for unpatched deployments, with no reported real-world exploitation beyond the POC at publication time (2025-08-23).
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25635
Vulnerability details
A security flaw has been discovered 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. This vulnerability affects the function setSysAdm of the file /goform/setSysAdm. The manipulation of the argument admpasshint results in stack-based buffer overflow. It is possible…
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to launch the attack remotely. The exploit has been released to the public and may be exploited. 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 network-accessible web form (/goform/setSysAdm) directly enables remote code execution against a public-facing application on the device.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation of the admpasshint input to prevent stack-based buffer overflow from improper handling.
Implements memory protections such as stack canaries, ASLR, and non-executable stacks to mitigate exploitation of the buffer overflow.
Mandates timely identification, reporting, and correction of flaws like this unpatched buffer overflow through firmware updates or device replacement.