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CVE-2020-8515 is an unauthenticated command injection vulnerability in DrayTek Vigor2960, Vigor3900, and Vigor300B devices running affected beta firmware versions, including Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta. The flaw is exposed through the cgi-bin/mainfunction.cgi endpoint, where insufficient sanitization of user-supplied input allows shell metacharacters to be interpreted by the underlying system shell. Successful exploitation enables remote execution of attacker-controlled commands as the root user without authentication.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a proof-of-concept exploit for CVE-2020-8515, a remote command injection vulnerability affecting Draytek Vigor routers (models 2960, 3900, 300B). The main exploit script, 'draytek.py', is a Python script that targets the router's web management interface, specifically the '/cgi-bin/mainfunction.cgi' endpoint. It sends a crafted POST request to this endpoint, injecting arbitrary shell commands via the 'keyPath' parameter. The script first probes the target by attempting to read '/etc/passwd' to check for vulnerability, then executes further commands (e.g., 'uname -a') if the target is confirmed vulnerable. The exploit can be easily modified to execute more complex payloads, such as downloading and running a reverse shell. The repository also includes a README.md with usage instructions, example output, and notes on extending the exploit. The exploit is operational and demonstrates remote code execution, but is not weaponized or part of a larger framework.
This repository contains an Nmap NSE script (http-draytek-rce.nse) designed to detect and exploit CVE-2020-8515, a pre-authentication remote code execution vulnerability affecting DrayTek Vigor2960, Vigor3900, and Vigor300B routers with specific firmware versions. The script first checks if the target is a DrayTek device, then safely tests for the vulnerability by injecting a unique string via a POST request to /cgi-bin/mainfunction.cgi. If the device is confirmed vulnerable, the script exploits the flaw to execute 'cat /etc/passwd', dumping the contents of the password file to demonstrate code execution as root. The repository also includes a README.md briefly describing the script's purpose. The main attack vector is network-based, targeting the web management interface of affected routers. The script is operational, providing both detection and exploitation capabilities.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A DrayTek firmware vulnerability actively exploited in July 2026 and explicitly linked to Dysphoria botnet exploitation of embedded devices.
A historical DrayTek vulnerability that remains exploited by the Dysphoria botnet for propagation.
A known RCE vulnerability in DrayTek products listed among the flaws used to compromise IoT devices for the Dysphoria botnet.
A classic IoT remote code execution vulnerability cited as exploited by Dysphoria for propagation and noted as widely exploited by botnets for years.
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.