CVE-2025-5739
Published: 06 June 2025
Summary
CVE-2025-5739 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, ranked in the top 17.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A critical buffer overflow vulnerability has been found in the TOTOLINK X15 router running firmware version 1.0.0-B20230714.1105. The flaw resides in an unknown portion of the /boafrm/formSaveConfig file within the HTTP POST Request Handler component, where manipulation of the submit-url argument can trigger the overflow. It is tracked as CVE-2025-5739 with CVSS 7.4 and is associated with CWE-119 and CWE-120.
The vulnerability can be exploited remotely by an authenticated attacker sending a specially crafted HTTP POST request. Successful exploitation may allow the attacker to achieve high impact on confidentiality, integrity, and availability of the affected device. A proof-of-concept exploit has been publicly disclosed and could be leveraged in attacks.
Public references point to detailed technical descriptions on VulDB and a GitHub repository containing exploit information, along with the vendor site, though no specific patch or mitigation guidance is detailed in the available references. The EPSS score remains low and stable near 0.0167 with no material increase observed.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-17104
Vulnerability details
A vulnerability classified as critical has been found in TOTOLINK X15 1.0.0-B20230714.1105. This affects an unknown part of the file /boafrm/formSaveConfig of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to buffer overflow. It is…
more
possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
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.