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CVE-2020-9054 is a pre-authentication OS command injection vulnerability in the web login CGI authentication handler of multiple Zyxel NAS and firewall products. Insufficient sanitization of the username parameter allows specially crafted HTTP GET or POST requests to execute arbitrary commands with web-server privileges. On affected NAS devices, a setuid utility can subsequently provide root-level command execution. Affected products include unpatched NAS devices running firmware 5.21 and earlier and certain UTM, ATP, and VPN firewalls running ZLD V4.35 Patch 0 through Patch 2; earlier firewall firmware is not affected. Exploitation can occur through direct network access or through a malicious website visited by a client that can reach the vulnerable device. The vulnerability has been exploited in the wild, including to deploy the Mirai variant Mukashi.
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Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (PoC) exploit for CVE-2020-9054. The main file, 'zyfuq.py', is a Python script that attempts to exploit a command injection vulnerability in a web login CGI script. The exploit works by sending a crafted POST request to the endpoint '/,adv/cgi-bin/weblogin.cgi' on a user-supplied target URL, injecting a shell command via the 'username' parameter. The script disables SSL warnings and expects the user to provide the target URL as a command-line argument. The default command executed is 'ls', but the code is structured to allow arbitrary commands. The repository also contains a README.md that notes the exploit is incomplete, but the provided code demonstrates the core injection technique. No hardcoded IPs or domains are present, but the endpoint path is fingerprintable. The exploit is a network-based PoC and does not include a weaponized or fully automated payload.
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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 remote code execution vulnerability in Zyxel NAS and firewall products' weblogin.cgi program caused by missing authentication, allowing OS command injection.
A command injection vulnerability in weblogin.cgi affecting multiple Zyxel NAS products, allowing unauthenticated OS command execution.
A security vulnerability exploited by Mirai botnet variants to compromise devices and expand botnet reach.
A vulnerability affecting Zyxel NAS devices, mentioned as a low-volume co-located service observed alongside 7777-Botnet infections (suggesting a possible but unconfirmed infection vector).
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.