CVE-2026-18588
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk46th percentile - higher than 46% of all known CVEs
Summary
In Wavlink WL-NU516U1 (version 708c073-mt7628), the fgets function in nas.cgi has a stack-based buffer overflow via the CONTENT_LENGTH argument. Remote exploitation is possible.
Risk Assessment
A remote attacker can crash the device or potentially execute arbitrary code, compromising device integrity and availability.
Recommendation
Update the device firmware to the version provided by the vendor.
Other vulnerabilities in Wavlink WL-NU516U1
See all- CVE-2026-18589Critical
In Wavlink WL-NU516U1 (version 708c073-mt7628), the change_password function in nas.cgi has a stack-based buffer overflow via the User1Passwd argument. The attack can be executed remotely, and the exploit is publicly available.
- CVE-2026-18590Medium
A vulnerability was determined in Wavlink WL-NU516U1 708c073-mt7628. Affected is the function set_sys_adm of the file adm.cgi of the component Admin Password Handler. This manipulation causes OS command injection. The attack is possible remotely and the exploit has been publicly disclosed. The vendor released a fixed version.
- CVE-2026-18587High
In the Wavlink WL-NU516U1 (version 708c073-mt7628), the config import function does not sanitize the Password argument, allowing remote OS command injection. The attack is complex but an exploit has been published.
- CVE-2026-15513Medium
A security flaw was discovered in Wavlink WL-NU516U1 version 260515. The function wlink_uci_set_value in the file /cgi-bin/adm.cgi allows remote OS command injection via manipulation of the lan_ip argument. The exploit has been publicly released and may be used in attacks.
Original NVD description (English source)
A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.