CVE-2025-8831
Published: 11 August 2025
Summary
CVE-2025-8831 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-2025-8831 is a stack-based buffer overflow vulnerability affecting the remoteManagement function in the /goform/remoteManagement endpoint on Linksys Wi-Fi range extenders, specifically models RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 running firmware versions up to 20250801. The issue stems from improper handling of the portNumber argument, 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 due to its potential for significant impact.
The vulnerability can be exploited remotely by an attacker with low privileges (PR:L), requiring network access and low attack complexity with no user interaction needed. Successful exploitation of the buffer overflow could grant high levels of confidentiality, integrity, and availability impact, potentially allowing arbitrary code execution, data corruption, or device denial of service on the affected range extender.
Advisories from VulDB (ctiid.319365, id.319365) 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 as of the CVE publication on 2025-08-11. The exploit has been publicly disclosed and may be actively used.
In notable context, no evidence of widespread real-world exploitation is reported, but the public availability of the proof-of-concept increases the risk for unpatched devices.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-24122
Vulnerability details
A vulnerability was found in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. This affects the function remoteManagement of the file /goform/remoteManagement. The manipulation of the argument portNumber leads to stack-based buffer overflow. It is possible to…
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initiate the attack 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 interface (/goform/remoteManagement) via portNumber parameter enables remote code execution on public-facing network devices, directly facilitating exploitation of public-facing applications and remote services.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly addresses the improper handling of the portNumber argument by enforcing validation of inputs to prevent stack-based buffer overflows.
Implements runtime memory protections such as stack canaries and non-executable stacks to mitigate exploitation of stack-based buffer overflows.
Ensures timely identification, reporting, and remediation of flaws like this buffer overflow through firmware updates or replacements.