Medium severity6.1NVD Advisory· Published Apr 22, 2019· Updated Jun 17, 2026
CVE-2019-9955
CVE-2019-9955
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
24- cpe:2.3:o:zyxel:atp200_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp500_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:atp800_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg20-vpn_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg40_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg40w_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg60_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg60w_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg110_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg210_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg310_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg1100_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg1900_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg2200-vpn_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_110_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_310_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zywall_1100_firmware:4.31:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn50_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn100_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:vpn300_firmware:-:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
5- www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-pagenvdPatchThird Party Advisory
- packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.htmlnvdExploitThird Party AdvisoryVDB Entry
- www.exploit-db.com/exploits/46706/nvdExploitThird Party AdvisoryVDB Entry
- seclists.org/fulldisclosure/2019/Apr/22nvdMailing ListThird Party Advisory
- www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtmlnvdVendor Advisory
News mentions
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