CVE-2025-8817
Published: 10 August 2025
Summary
CVE-2025-8817 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 24.1% 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-2025-8817 is a stack-based buffer overflow vulnerability affecting the setLan function in the /goform/setLan file on Linksys range extender models RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 running firmware versions up to 20250801. The issue arises from manipulation of the lan2enabled argument, classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow). It has a CVSS v3.1 base score of 8.8, indicating high severity.
The vulnerability can be exploited remotely over the network with low attack complexity and requires low privileges (PR:L), such as those of an authenticated user, with no user interaction needed. Successful exploitation grants high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H), potentially allowing arbitrary code execution, data compromise, or device disruption via the buffer overflow.
Advisories from VulDB (ctiid.319351, id.319351) and a public GitHub disclosure detail the vulnerability, including a proof-of-concept exploit. The vendor was notified early but has not responded or issued patches, leaving affected devices unmitigated. Security practitioners should isolate or replace vulnerable firmware immediately, as the exploit is publicly available.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-24098
Vulnerability details
A vulnerability was identified in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. Affected by this vulnerability is the function setLan of the file /goform/setLan. The manipulation of the argument lan2enabled leads to stack-based buffer overflow. The…
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attack can be launched remotely. The exploit 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/setLan) of Linksys Wi-Fi range extenders enables remote exploitation of a public-facing application for potential code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the stack-based buffer overflow by enforcing validation of inputs like the lan2enabled argument in the setLan function.
Provides memory protections such as stack canaries, ASLR, and non-executable stacks to prevent exploitation of stack-based buffer overflows.
Mandates identification, prioritization, and timely patching of firmware flaws like CVE-2025-8817 to eliminate the buffer overflow vulnerability.