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CVE-2021-35408 is an unauthenticated OS command injection vulnerability in the Prolink PRC2402M router, observed on firmware version 20190909. The flaw is in the /cgi-bin/qos.cgi CGI handler. When the page parameter is set to qos_sta, qos.cgi invokes qos_sta_settings, which reads the user-controlled cli_list and cli_num parameters and uses sprintf to construct the shell command '/sbin/sta_qos.sh setup %s %s'. That command string is then passed to system without sufficient input validation or sanitization. Because attacker-controlled input is incorporated directly into a shell command, a remote attacker can submit a crafted HTTP POST request to /cgi-bin/qos.cgi and execute arbitrary commands on the device.
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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 command injection vulnerability in the Prolink PRC2402M router's qos.cgi script that allows arbitrary code execution as root.
Query your assets running an affected version, and investigate the blast radius.
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.