CVE-2025-8833
Published: 11 August 2025
Summary
CVE-2025-8833 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-2025-8833 is a stack-based buffer overflow vulnerability in the langSwitchBack function within the /goform/langSwitchBack file of 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 langSelectionOnly 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 due to its potential for significant impact.
The vulnerability can be exploited remotely by an attacker with low privileges (PR:L), requiring network access but no user interaction. Successful exploitation allows arbitrary code execution, potentially granting high levels of confidentiality, integrity, and availability impact, such as full device compromise, data theft, or further network pivoting from the affected range extender.
Advisories from VulDB note that the vendor was contacted early regarding disclosure but provided no response, and no patches or mitigations are mentioned. A proof-of-concept exploit is publicly available on GitHub, increasing the risk of active exploitation.
The exploit has been disclosed to the public, with detailed documentation and PoC code hosted on GitHub repositories linked via VulDB entries. No evidence of real-world exploitation in the wild is reported.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-24124
Vulnerability details
A vulnerability was identified in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. This issue affects the function langSwitchBack of the file /goform/langSwitchBack. The manipulation of the argument langSelectionOnly leads to stack-based buffer overflow. The attack may…
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be initiated 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 remote web management interface (/goform/langSwitchBack) of Linksys range extenders enables exploitation of a public-facing application for unauthenticated remote code execution or denial of service.
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 the langSelectionOnly input argument in the langSwitchBack function.
Implements memory protections such as stack canaries, ASLR, and DEP to prevent exploitation of the stack buffer overflow vulnerability.
Requires timely remediation of the known buffer overflow flaw through firmware updates, replacement, or isolation of affected Linksys range extenders.