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TI-2019-07321 Aliases CVE-2019-9955GHSA-9r2m-gm27-q4jp

On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W…

Priority MEDIUM 46CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.2118 97th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 42

CPEVersionsRoleVendor
cpe:2.3:o:zyxel:atp200_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:atp500_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:atp800_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg20-vpn_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:o:zyxel:atp200_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:atp500_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:atp800_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg20-vpn_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg20-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg20w-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 32 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:zyxel:usg40_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg40w_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg60_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg60w_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg110_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg210_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg310_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg1100_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg1900_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:usg2200-vpn_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:zywall_110_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:zywall_110:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:zywall_310_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:zywall_310:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:zywall_1100_firmware:4.31:*:*:*:*:*:*:*4.31VulnerableZyxel
cpe:2.3:h:zyxel:zywall_1100:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:vpn50_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableZyxel
cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:vpn100_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableZyxel
cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:vpn300_firmware:-:*:*:*:*:*:*:*not specified by NVDVulnerableZyxel
cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:o:zyxel:usg40_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg40:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg40w_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg40w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg60_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg60:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg60w_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg60w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg110_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg210_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg310_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg1100_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg1900_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:usg2200-vpn_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:zywall_110_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:zywall_110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:zywall_310_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:zywall_310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:zywall_1100_firmware:4.31:*:*:*:*:*:*:* Versions 4.31 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:zywall_1100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:vpn50_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:vpn50:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:vpn100_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:vpn300_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:vpn300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-9955
  2. 2026-10-03 Alias added: GHSA-9r2m-gm27-q4jp

References

Exploit 2

Patch 1

Advisory 2

  • TI-2023-16198 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-16197 Buffer overflow in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-13281 OS command injection in Zyxel ZyWALL/USG series firmware KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-12682 OS command injection in Zyxel USG FLEX 100 firmware KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-17772 Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-07267 OS command injection in Zyxel NAS326 KEVCVSS 3.1CRITICAL 9.8
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences