CVE-2025-25668
Published: 20 February 2025
Summary
CVE-2025-25668 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Tenda Ac8 Firmware. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25.9th percentile by exploit likelihood (below the median); 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-2025-25668 is a stack overflow vulnerability in the Tenda AC8V4 router firmware version V16.03.34.06. The flaw occurs in the sub_47D878 function when processing the shareSpeed parameter, classified under CWE-120 (Buffer Copy without Checking Size of Input). It was published on 2025-02-20.
The vulnerability carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating it is exploitable over the network with low complexity, no privileges, no user interaction, and unchanged impact scope. Remote attackers require only network access to trigger the stack overflow, potentially achieving high confidentiality, integrity, and availability impacts such as arbitrary code execution or denial of service.
Mitigation details are available in the referenced advisory at https://github.com/jangfan/my-vuln/blob/main/Tenda/AC8V4/setMacFilterCfg.md.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-4497
Vulnerability details
Tenda AC8V4 V16.03.34.06 was discovered to contain a stack overflow via the shareSpeed parameter in the sub_47D878 function.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack overflow vulnerability in Tenda AC8V4 router firmware via web parameter (shareSpeed) 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
Requires validation of untrusted inputs like the shareSpeed parameter to prevent buffer overflows from unchecked data sizes.
Implements memory protections such as stack canaries and non-executable stacks to block exploitation of stack overflows leading to code execution or DoS.
Mandates timely remediation of identified flaws like CVE-2025-25668 through firmware patching to eliminate the stack overflow vulnerability.