CVE-2025-9481
Published: 26 August 2025
Summary
CVE-2025-9481 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 31.2% 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-2025-9481 is a stack-based buffer overflow vulnerability in the setIpv6 function within the /goform/setIpv6 endpoint 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 issue arises from improper handling of the tunrd_Prefix argument, as classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow). 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.
Remote attackers with low privileges, such as authenticated users on the device, can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation allows arbitrary code execution, potentially granting high-impact confidentiality, integrity, and availability compromises, including full device takeover or denial of service.
Advisories from VulDB and a public GitHub disclosure detail the vulnerability but note no vendor response despite early notification; no patches or official mitigations are available. A proof-of-concept exploit is publicly available in the referenced GitHub repository, increasing the risk of active exploitation.
The exploit has been disclosed publicly and may be used in the wild, though no confirmed real-world attacks are reported in the available data.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25794
Vulnerability details
A security vulnerability has been detected 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 affects the function setIpv6 of the file /goform/setIpv6. The manipulation of the argument tunrd_Prefix leads to stack-based buffer overflow. Remote exploitation of the…
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attack is possible. The exploit has been disclosed publicly 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 public-facing web endpoint /goform/setIpv6 allows remote exploitation for initial access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation of inputs like the tunrd_Prefix argument to prevent stack-based buffer overflows in the setIpv6 function.
Implements memory protection mechanisms such as stack canaries, ASLR, and DEP to mitigate exploitation of stack-based buffer overflows.
Establishes processes to monitor for and remediate flaws like CVE-2025-9481 through firmware updates or replacements.