CVE-2025-6399
Published: 21 June 2025
Summary
CVE-2025-6399 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 7.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 19.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A critical buffer overflow vulnerability exists in the TOTOLINK X15 router firmware version 1.0.0-B20230714.1105. The flaw resides in an unknown function within the file /boafrm/formIPv6Addr of the HTTP POST Request Handler component, where improper handling of the submit-url argument allows an attacker to overflow a buffer. The issue is tracked under CWE-119 and CWE-120 and carries a CVSS 4.0 score of 7.4.
An authenticated remote attacker can send a crafted HTTP POST request to the affected endpoint and achieve arbitrary code execution or a denial of service on the device. Public proof-of-concept code demonstrating the exploit has been released, confirming that the attack requires no user interaction beyond network reachability to the router's web interface.
The associated EPSS score remains low at approximately 0.0136 with a peak of 0.0137, indicating limited observed exploitation interest to date. No vendor advisory or patch information is referenced in the available sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-18804
Vulnerability details
A vulnerability, which was classified as critical, was found in TOTOLINK X15 1.0.0-B20230714.1105. Affected is an unknown function of the file /boafrm/formIPv6Addr of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It…
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is possible 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?
Buffer overflow in router's HTTP POST handler (/boafrm/formIPv6Addr) via 'submit-url' argument enables remote exploitation of a public-facing web application.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.