CVE-2019-9955 : On Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, US

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.

Published 2019-04-22 20:29:00

Updated 2019-04-30 14:34:37

Source MITRE

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2019-9955

Zyxel » Zywall 110 Firmware » Version: 4.31
cpe:2.3:o:zyxel:zywall_110_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 110 » Version: N/A
Zyxel » Zywall 1100 Firmware » Version: 4.31
cpe:2.3:o:zyxel:zywall_1100_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 1100 » Version: N/A
Zyxel » Zywall 310 Firmware » Version: 4.31
cpe:2.3:o:zyxel:zywall_310_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Zywall 310 » Version: N/A
Zyxel » Atp200 Firmware » Version: 4.31
cpe:2.3:o:zyxel:atp200_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Atp200 » Version: N/A
Zyxel » Atp500 Firmware » Version: 4.31
cpe:2.3:o:zyxel:atp500_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Atp500 » Version: N/A
Zyxel » Atp800 Firmware » Version: 4.31
cpe:2.3:o:zyxel:atp800_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Atp800 » Version: N/A
Zyxel » Usg20-vpn Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg20-vpn_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20-vpn » Version: N/A
Zyxel » Usg20w-vpn Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg20w-vpn_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg20w-vpn » Version: N/A
Zyxel » Usg40 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg40_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg40 » Version: N/A
Zyxel » Usg40w Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg40w_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg40w » Version: N/A
Zyxel » Usg60 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg60_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg60 » Version: N/A
Zyxel » Usg60w Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg60w_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg60w » Version: N/A
Zyxel » Usg110 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg110_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg110 » Version: N/A
Zyxel » Usg210 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg210_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg210 » Version: N/A
Zyxel » Usg310 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg310_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg310 » Version: N/A
Zyxel » Usg1100 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg1100_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg1100 » Version: N/A
Zyxel » Usg1900 Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg1900_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg1900 » Version: N/A
Zyxel » Usg2200-vpn Firmware » Version: 4.31
cpe:2.3:o:zyxel:usg2200-vpn_firmware:4.31:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Usg2200-vpn » Version: N/A
Zyxel » Vpn50 Firmware » Version: N/A
cpe:2.3:o:zyxel:vpn50_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Vpn50 » Version: N/A
Zyxel » Vpn100 Firmware » Version: N/A
cpe:2.3:o:zyxel:vpn100_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Vpn100 » Version: N/A
Zyxel » Vpn300 Firmware » Version: N/A
cpe:2.3:o:zyxel:vpn300_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Zyxel » Vpn300 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2019-9955

EPSS FAQ

6.48%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 94 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-9955

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2019-9955

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

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-9955

https://www.exploit-db.com/exploits/46706/

Exploit;Third Party Advisory;VDB Entry
http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html

Exploit;Third Party Advisory;VDB Entry
https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml

Vendor Advisory
https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page

Patch;Third Party Advisory
http://seclists.org/fulldisclosure/2019/Apr/22

Full Disclosure: CVE-2019-9955 Refelected XSS on Zyxel Login page
Mailing List;Third Party Advisory

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Vulnerability Details : CVE-2019-9955

Products affected by CVE-2019-9955

Exploit prediction scoring system (EPSS) score for CVE-2019-9955

CVSS scores for CVE-2019-9955

CWE ids for CVE-2019-9955

References for CVE-2019-9955