CVE-2025-6825
Published: 28 June 2025
Summary
CVE-2025-6825 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Totolink A702R 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, tracked as CVE-2025-6825 and assigned CWE-119 and CWE-120, affects the TOTOLINK A702R wireless router in firmware versions up to 4.0.0-B20230721.1521. The flaw resides in an unknown function within the file /boafrm/formWlSiteSurvey that is part of the HTTP POST Request Handler component; specifically, improper handling of the submit-url argument supplied in a crafted request allows an attacker to overflow a buffer.
The vulnerability can be exploited remotely by an authenticated attacker who sends a malicious HTTP POST request to the affected endpoint. Successful exploitation grants the attacker the ability to execute arbitrary code or crash the device, resulting in high impacts to confidentiality, integrity, and availability as reflected in the CVSS 7.4 score.
Public references, including a GitHub repository containing proof-of-concept code, confirm that exploit details have been disclosed and may be usable against unpatched devices. The associated EPSS score remains low at approximately 0.0136 with a negligible peak of 0.0137, indicating limited observed exploitation interest to date. No vendor advisory or official patch information is referenced in the available sources.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-19459
Vulnerability details
A vulnerability classified as critical was found in TOTOLINK A702R up to 4.0.0-B20230721.1521. Affected by this vulnerability is an unknown functionality of the file /boafrm/formWlSiteSurvey of the component HTTP POST Request Handler. The manipulation of the argument submit-url leads to…
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buffer overflow. The attack can be launched 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 the HTTP POST handler (/boafrm/formWlSiteSurvey) of the TOTOLINK A702R router's web interface enables remote exploitation of a public-facing 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.