CVE-2019-9955 EXPLOIT
6.1
MEDIUM · CVSS 3.0 · EPSS 21.2% (pctl 98)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.1 (MEDIUM, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| EPSS | 21.18% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-79 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2019-04-22 |
| Last modified | 2026-06-17 |
Affected (40)
| Vendor | Product |
|---|---|
| zyxel | atp200 |
| zyxel | atp200 firmware |
| zyxel | atp500 |
| zyxel | atp500 firmware |
| zyxel | atp800 |
| zyxel | atp800 firmware |
| zyxel | usg110 |
| zyxel | usg110 firmware |
| zyxel | usg1100 |
| zyxel | usg1100 firmware |
| zyxel | usg1900 |
| zyxel | usg1900 firmware |
| zyxel | usg20-vpn |
| zyxel | usg20-vpn firmware |
| zyxel | usg20w-vpn |
| zyxel | usg20w-vpn firmware |
| zyxel | usg210 |
| zyxel | usg210 firmware |
| zyxel | usg2200-vpn |
| zyxel | usg2200-vpn firmware |
| zyxel | usg310 |
| zyxel | usg310 firmware |
| zyxel | usg40 |
| zyxel | usg40 firmware |
| zyxel | usg40w |
| zyxel | usg40w firmware |
| zyxel | usg60 |
| zyxel | usg60 firmware |
| zyxel | usg60w |
| zyxel | usg60w firmware |
| zyxel | vpn100 |
| zyxel | vpn100 firmware |
| zyxel | vpn50 |
| zyxel | vpn50 firmware |
| zyxel | zywall 110 |
| zyxel | zywall 110 firmware |
| zyxel | zywall 1100 |
| zyxel | zywall 1100 firmware |
| zyxel | zywall 310 |
| zyxel | zywall 310 firmware |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Zyxel ZyWall 310 / ZyWall 110 / USG1900 / ATP500 / USG40 - Login Page Cross-Site Scripting | 2019-04-16 |
References
- http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2019/Apr/22
- https://www.exploit-db.com/exploits/46706/
- https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page
- https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml
- http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2019/Apr/22
- https://www.exploit-db.com/exploits/46706/
- https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page
- https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml
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