CVE-2025-6393
Published: 21 June 2025
Summary
CVE-2025-6393 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Totolink A3002Ru Firmware. Its CVSS base score is 7.4 (High).
Operationally, ranked in the top 11.4% 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 buffer overflow vulnerability has been identified in TOTOLINK A702R, A3002R, A3002RU, and EX1200T routers running firmware versions 3.0.0-B20230809.1615, 4.0.0-B20230531.1404, 4.0.0-B20230721.1521, and 4.1.2cu.5232_B20210713. The flaw exists in an unknown function of the /boafrm/formIPv6Addr file within the HTTP POST Request Handler, where improper handling of the submit-url argument enables the overflow. It is tracked under CWE-119 and CWE-120 and carries a CVSS 4.0 score of 7.4.
The vulnerability is remotely exploitable by an authenticated attacker with low privileges and no user interaction required. Successful exploitation can result in high impact to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or service disruption. Public exploit code has already been disclosed.
References consist of disclosure entries on GitHub and Vuldb with no official vendor advisories or patch details provided. EPSS scores have remained low and stable near 0.04, showing no material increase after publication.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-18887
Vulnerability details
A vulnerability was found in TOTOLINK A702R, A3002R, A3002RU and EX1200T 3.0.0-B20230809.1615/4.0.0-B20230531.1404/4.0.0-B20230721.1521/4.1.2cu.5232_B20210713. It has been classified as critical. Affected is an unknown function of the file /boafrm/formIPv6Addr of the component HTTP POST Request Handler. The manipulation of the argument submit-url…
more
leads to buffer overflow. It is possible to launch 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.