CVE-2026-121618
MediumCVSS 5.3Summary
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.
Risk Assessment
Information disclosure may provide an attacker with data useful for further attacks on the device or network. Public availability of the exploit increases the risk.
Recommendation
Replace the device 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-2026-121617High
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-2026-121615Critical
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.
- 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 weakness has been identified in Linksys E5600 1.1.0.26. This affects an unknown part of the file /cgi-bin/fqc.cgi of the component Factory Quality Control. This manipulation causes information disclosure. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks. 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