Home/CVE/On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, U
CVE

CVE-2019-9955

On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, U

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.

MEDIUM · CVSS 6.1 EPSS 0.10697
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

21
zyxel atp200 firmwareall versions
zyxel atp500 firmwareall versions
zyxel atp800 firmwareall versions
zyxel usg20-vpn firmwareall versions
zyxel usg20w-vpn firmwareall versions
zyxel usg40 firmwareall versions
zyxel usg40w firmwareall versions
zyxel usg60 firmwareall versions
⚠

Public Exploits & PoCs

4
webappsZyxel ZyWall 310 / ZyWall 110 / USG1900 / ATP500 / USG40 - Login Page Cross-Site Scripting2019-04-16
nucleiZyxel - Cross-Site Scriptingmedium
pocpacketstormsecurity.com · Zyxel-ZyWall-Cross-Site-Scripting.htmlpacketstormsecurity.com
pocwww.exploit-db.com · 46706www.exploit-db.com
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Apr 2019 · 08:29 PM
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://seclists.org/fulldisclosure/2019/Apr/22Mailing ListThird Party Advisory
https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-pagePatchThird Party Advisory
https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtmlVendor Advisory
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