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CVE-2021-35401 is an unauthenticated OS command injection vulnerability in the Prolink PRC2402M router, tested on firmware version 20190909. The flaw is in /cgi-bin/login.cgi, specifically the sys_login code path reached when the POST parameter page=login and langChange is not equal to "1". In that path, the application reads the attacker-controlled key parameter from the HTTP request body, concatenates it with the stored Password value from NVRAM, formats a shell command using sprintf with the pattern "echo -n '%s' | md5sum", and executes it via popen. Because the key parameter is not properly validated or sanitized before being embedded in a shell command, an attacker can inject shell metacharacters and execute arbitrary commands. The vulnerable process runs with root privileges on the router.
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No public exploit code observed for this vulnerability.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A command injection vulnerability affecting the PROLiNK PRC2402M router.
An unauthenticated remote code execution vulnerability in the Prolink PRC2402M router's login.cgi/sys_login functionality, caused by unsanitized user input being passed to popen and enabling arbitrary command execution as root.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.