Description
On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, USG1900, USG2200-VPN, ZyWALL 110, ZyWALL 310, ZyWALL 1100 devices, the security firewall login page is vulnerable to Reflected XSS via the unsanitized 'mp_idx' parameter.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Zyxel ZyWall 310 / ZyWall 110 / USG1900 / ATP500 / USG40 - Login Page Cross-Site Scripting EDB-46706 · webapps · Apr 16, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Zyxel - Cross-Site Scripting http/cves/2019/CVE-2019-9955.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page
- 20190416 CVE-2019-9955 Refelected XSS on Zyxel Login page mailing-list
- 46706 exploit
- http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html
- https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml