CVE-2026-3613
Published: 06 March 2026
Summary
CVE-2026-3613 is a high-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Wavlink Wl-Nu516U1 Firmware. Its CVSS base score is 7.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 33.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
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.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
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.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in public-facing /cgi-bin/login.cgi web endpoint of router firmware directly enables remote authenticated RCE via exploitation of an Internet-facing application (T1190).
NVD Description
A vulnerability was identified in Wavlink WL-NU516U1 V240425. This vulnerability affects the function sub_401A0C of the file /cgi-bin/login.cgi. Such manipulation of the argument ipaddr leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is…
more
publicly available and might be used. The vendor was contacted early about this disclosure.
Deeper analysisAI
CVE-2026-3613 is a stack-based buffer overflow vulnerability in the Wavlink WL-NU516U1 router firmware version V240425. The flaw affects the sub_401A0C function within the /cgi-bin/login.cgi component, triggered by manipulation of the ipaddr argument. Associated with CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-121 (Stack-based Buffer Overflow), it was published on 2026-03-06 with a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
The vulnerability enables remote exploitation by an attacker possessing high privileges on the target system. Successful exploitation can result in high-impact compromise of confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system crashes. A public exploit is available, as detailed in a GitHub repository, which may facilitate attacks against vulnerable devices.
Advisories from VulDB (ctiid.349221, id.349221, submit.755341) and the referenced GitHub proof-of-concept confirm the remote attack vector and public disclosure of the exploit. The vendor was contacted early regarding the issue, though no specific patches or mitigations are outlined in these sources. Security practitioners should monitor for firmware updates and restrict access to the affected login.cgi endpoint.
Details
- CWE(s)