XSS in Zyxel Atp200
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 devices, the security firewall login page is vulnerable to Reflected XSS via the unsanitized 'mp_idx' parameter.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.212 (97.5th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.212 · newest: 0.212 · change: 0.000
Affected products
- Zyxel Atp200
- Zyxel Atp200 Firmware — versions 4.31
- Zyxel Atp500
- Zyxel Atp500 Firmware — versions 4.31
- Zyxel Atp800
- Zyxel Atp800 Firmware — versions 4.31
- Zyxel Usg110
- Zyxel Usg1100
- Zyxel Usg1100 Firmware — versions 4.31
- Zyxel Usg110 Firmware — versions 4.31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Logi… (Patch, Third Party Advisory)
- seclists.org/fulldisclosure/2019/Apr/22 (mailing-list, Mailing List, Third Party Advisory)
- www.exploit-db.com/exploits/46706/ (Exploit, VDB Entry, Third Party Advisory, exploit)
- packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html (Exploit, VDB Entry, Third Party Advisory)
- www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls… (Vendor Advisory)
Frequently asked questions
- What is CVE-2019-9955?
- CVE-2019-9955 is a medium-severity vulnerability in Zyxel Atp200, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-22.
- How severe is CVE-2019-9955?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2019-9955 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.