CVE-2025-8243
Published: 27 July 2025
Summary
CVE-2025-8243 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Totolink X15 Firmware. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 22.7% 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Implements input validation mechanisms at HTTP POST endpoints to restrict the devicemac1 argument and prevent buffer overflows.
Enforces memory protections like non-executable stacks and ASLR to mitigate exploitation of the buffer overflow even if triggered.
Requires timely identification, reporting, and correction of the specific buffer overflow flaw in the router firmware.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Buffer overflow in public-facing HTTP POST handler (/boafrm/formMapDel) directly enables remote exploitation of the router's web interface for code execution.
NVD Description
A vulnerability was found in TOTOLINK X15 1.0.0-B20230714.1105 and classified as critical. This issue affects some unknown processing of the file /boafrm/formMapDel of the component HTTP POST Request Handler. The manipulation of the argument devicemac1 leads to buffer overflow. The…
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attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-8243 is a critical buffer overflow vulnerability (CVSS v3.1 score of 8.8; AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) affecting the TOTOLINK X15 router on firmware version 1.0.0-B20230714.1105. The flaw exists in an unknown processing function of the HTTP POST Request Handler component, specifically the /boafrm/formMapDel endpoint, where manipulation of the "devicemac1" argument triggers the overflow. It is associated with CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-120 (Buffer Copy without Bounds Checking), and CWE-787 (Out-of-bounds Write).
A remote attacker with low privileges can exploit this vulnerability by sending a malicious HTTP POST request to the affected endpoint. No user interaction is required, and the low attack complexity enables reliable exploitation. Successful attacks can result in high confidentiality, integrity, and availability impacts, potentially compromising the device.
Advisories on VulDB (e.g., https://vuldb.com/?ctiid.317831, https://vuldb.com/?id.317831) document the issue, with a public exploit disclosed on GitHub (https://github.com/panda666-888/vuls/blob/main/totolink/x15/formMapDel.md). The vendor website (https://www.totolink.net/) is referenced, but no specific patch or mitigation details are provided in the available information.
The exploit has been publicly disclosed and may be used, as noted in the CVE description published on 2025-07-27.
Details
- CWE(s)