CVE-2025-12260
Published: 27 October 2025
Summary
CVE-2025-12260 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Totolink A3300R 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 45.1% 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-2025-12260 is a stack-based buffer overflow vulnerability affecting the TOTOLINK A3300R router on firmware version 17.0.0cu.557_B20221024. The flaw resides in the setSyslogCfg function within the /cgi-bin/cstecgi.cgi file, part of the POST Parameter Handler component. It is triggered by manipulation of the "enable" argument and has 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), mapped to CWE-119 and CWE-121. The vulnerability was published on 2025-10-27.
An attacker with low privileges can exploit this remotely over the network by sending a crafted request to the vulnerable endpoint. No user interaction is required, and the low complexity enables reliable exploitation. Successful attacks can result in high-impact compromise of confidentiality, integrity, and availability, likely enabling remote code execution via the stack-based buffer overflow.
An exploit has been publicly disclosed on GitHub, increasing the risk of active use. Security advisories on VulDB provide further details, and practitioners should check the vendor site at www.totolink.net for patches or mitigation recommendations.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-36154
Vulnerability details
A vulnerability has been found in TOTOLINK A3300R 17.0.0cu.557_B20221024. The impacted element is the function setSyslogCfg of the file /cgi-bin/cstecgi.cgi of the component POST Parameter Handler. Such manipulation of the argument enable leads to stack-based buffer overflow. It is possible…
more
to launch the attack remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in the web CGI endpoint (/cgi-bin/cstecgi.cgi) enables remote code execution via exploitation of a public-facing application on the router.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mandates timely patching or remediation of the stack-based buffer overflow vulnerability in the setSyslogCfg function.
Requires validation of the 'enable' POST parameter to prevent the buffer overflow triggered by malformed input.
Implements memory protection mechanisms such as stack canaries and ASLR to mitigate exploitation of the stack-based buffer overflow.