CVE-2026-3661 Wavlink WL-NU516U1 adm.cgi ota_new_upgrade command injection
Remote attackers can execute arbitrary commands on Wavlink WL-NU516U1 routers via the ota_new_upgrade function in adm.cgi.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3661?
CVE-2026-3661 is a medium-severity command injection vulnerability in Wavlink WL-NU516U1, published on 7 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A flaw has been found in Wavlink WL-NU516U1 240425. This affects the function ota_new_upgrade of the file /cgi-bin/adm.cgi. This manipulation of the argument model causes command injection. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure.
Which versions are affected by CVE-2026-3661?
It affects 1 product.
Products include Wavlink Wl-Nu516u1 Firmware.
How do I fix CVE-2026-3661?
No fix has been published for CVE-2026-3661 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-3661 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3661 exists.
Other vulnerabilities in Wavlink WL-NU516U1
- CVE-2026-3703 Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write
- CVE-2026-4861 Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow
- CVE-2026-3612 Wavlink WL-NU516U1 OTA Online Upgrade adm.cgi sub_405AF4 command injection
- CVE-2026-3613 Wavlink WL-NU516U1 login.cgi sub_401A0C stack-based overflow
- CVE-2026-2615 Wavlink WL-NU516U1 firewall.cgi singlePortForwardDelete command injection
Sources
Also known as GHSA-pjpj-3w53-j35f.