Login Request a demo
Medium severity · published Apr 22, 2019
CVE-2019-9955
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…
6.1
CVSS
21.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)21.2% · higher than 98% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp200 Firmware · Zyxel
4.31 · source: NVD
AF
Atp500 Firmware · Zyxel
4.31 · source: NVD
AF
Atp800 Firmware · Zyxel
4.31 · source: NVD
UF
Usg110 Firmware · Zyxel
4.31 · source: NVD
UF
Usg1100 Firmware · Zyxel
4.31 · source: NVD
UF
Usg1900 Firmware · Zyxel
4.31 · source: NVD
UF
Usg20-vpn Firmware · Zyxel
4.31 · source: NVD
UF
Usg20w-vpn Firmware · Zyxel
4.31 · source: NVD
UF
Usg210 Firmware · Zyxel
4.31 · source: NVD
UF
Usg2200-vpn Firmware · Zyxel
4.31 · source: NVD
UF
Usg310 Firmware · Zyxel
4.31 · source: NVD
UF
Usg40 Firmware · Zyxel
4.31 · source: NVD
Affected product
AF
Atp200 Firmware
Zyxel
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-9955
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-9955
Exploit
http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html
Mailing List
http://seclists.org/fulldisclosure/2019/Apr/22
Exploit
https://www.exploit-db.com/exploits/46706/
Patch
https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page
Vendor Advisory
https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml
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