CVE-2025-9575
Published: 28 August 2025
Summary
CVE-2025-9575 is a low-severity Command Injection (CWE-77) vulnerability in Linksys Re6250 Firmware. Its CVSS base score is 2.1 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 24.9% 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 AC-6 (Least Privilege).
Deeper analysis
CVE-2025-9575 is an OS command injection vulnerability affecting the cgiMain function in the /cgi-bin/upload.cgi 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 flaw arises from manipulation of the 'filename' argument, enabling injection of operating system commands, and is classified under CWE-77 and CWE-78.
The vulnerability is exploitable remotely (AV:N) by attackers possessing low privileges (PR:L) with low complexity (AC:L) and no user interaction required (UI:N), resulting in a CVSS v3.1 base score of 6.3 (medium severity) with low impacts to confidentiality, integrity, and availability (C:L/I:L/A:L). Exploitation allows remote attackers to execute arbitrary OS commands on the device.
Advisories and references, including VulDB entries (ctiid.321689, id.321689, submit.634840) and a GitHub repository detailing the issue and proof-of-concept, confirm the exploit has been publicly disclosed and may be utilized. The vendor was contacted early regarding disclosure but provided no response, and no patches or official mitigations are mentioned.
The exploit's public availability increases risk for unpatched devices, with no reported real-world exploitation beyond disclosure as of publication on 2025-08-28.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-26141
Vulnerability details
A vulnerability was determined 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 issue affects the function cgiMain of the file /cgi-bin/upload.cgi. Executing manipulation of the argument filename can lead to os command injection. The attack may be…
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performed from a remote location. The exploit has been publicly disclosed and may be utilized. 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?
Remote OS command injection via unauthenticated upload.cgi filename parameter in Linksys Wi-Fi extenders enables exploitation of public-facing web application (T1190), indirect command execution (T1202), and Unix shell command execution (T1059.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of the filename argument in upload.cgi to block OS command injection before execution.
Enforces least privilege on the web server/CGI process so that even successful command injection yields minimal OS-level impact on the extender.
Monitors integrity of firmware and CGI scripts to detect unauthorized modifications or injected commands after exploitation.