CVE-2026-121615
CriticalCVSS 10.0Summary
Linksys E5600 1.1.0.26 contains an improper authentication vulnerability in /cgi-bin/mesh_login.cgi (Login Handler). The attack can be launched remotely and the exploit has been publicly disclosed. The vendor did not respond and the product is no longer supported.
Risk Assessment
Authentication mechanisms may be bypassed, allowing unauthorized access to the device. Since the exploit is public, the risk of exploitation is high.
Recommendation
Replace the Linksys E5600 with a supported model or isolate it from the network, as the vendor will not provide a fix.
Other vulnerabilities in Linksys E5600
See all- CVE-2026-121618Medium
Linksys E5600 1.1.0.26 contains an information disclosure vulnerability in /cgi-bin/fqc.cgi (Factory Quality Control). Remote exploitation is possible and the exploit has been made public. The vendor did not respond and the product is no longer supported.
- CVE-2026-121617High
Linksys E5600 1.1.0.26 has an out-of-bounds write in the init_multipart function of /cgi-bin/upload_fw.cgi (Header Parser). The attack can be launched remotely and the exploit is publicly available. The vendor did not respond and the product is no longer supported.
- CVE-2026-121616Medium
Linksys E5600 1.1.0.26 has an out-of-bounds write in the strcpy function of /cgi-bin/mesh_login.cgi (JSON Request Parser) when manipulating the username/password/token/source/cn/action arguments. The attack can be initiated remotely and the exploit is publicly available. The vendor did not respond and the product is no longer supported.
- CVE-2025-29229Critical
Linksys E5600 version V1.1.0.26 is vulnerable to command injection in the ddnsStatus function. The description provides no further technical details.
Original NVD description (English source)
A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an unknown function of the file /cgi-bin/mesh_login.cgi of the component Login Handler. Executing a manipulation can lead to improper authentication. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS