CVE-2025-9252
Published: 20 August 2025
Summary
CVE-2025-9252 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 39.4% 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-2025-9252 is a stack-based buffer overflow vulnerability affecting the DisablePasswordAlertRedirect function in the /goform/DisablePasswordAlertRedirect file on 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 issue, published on 2025-08-20, stems from improper handling of the 'hint' argument (CWE-119, CWE-121) and 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).
The vulnerability enables remote exploitation by attackers with low privileges, such as authenticated users on the device. By manipulating the 'hint' argument, an attacker can trigger the buffer overflow, potentially achieving high-impact confidentiality, integrity, and availability violations, including arbitrary code execution.
VulDB advisories (ctiid.320783, id.320783) and a GitHub repository detail the vulnerability and provide a public exploit. The vendor, Linksys, was notified early but has not responded or issued patches, leaving affected devices without official mitigations.
An exploit is publicly available, increasing the risk of active exploitation against unpatched extenders.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25401
Vulnerability details
A weakness has been identified 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. Affected by this vulnerability is the function DisablePasswordAlertRedirect of the file /goform/DisablePasswordAlertRedirect. Executing manipulation of the argument hint can lead to stack-based buffer overflow. The…
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attack can be launched remotely. The exploit has been made available to the public and could 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 web form handler (/goform/) directly enables remote code execution against the device's HTTP interface, matching T1190 Exploit Public-Facing Application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the improper handling of the 'hint' argument by enforcing input validation to prevent stack-based buffer overflows from malicious remote inputs.
Implements memory protections such as stack canaries, ASLR, and DEP to mitigate exploitation of stack-based buffer overflows even if invalid input reaches the vulnerable function.
Requires identification, reporting, and remediation of flaws like CVE-2025-9252, including vulnerability scanning and compensatory controls such as isolation until patched.