{"id":"CVE-2019-9955","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-9955","generatedAt":"2026-10-27T21:16:46.339Z","title":"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…","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.","published":"2019-04-22T20:29:00.000Z","lastModified":"2026-06-17T02:44:55.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["zyxel/atp200 firmware","zyxel/atp500 firmware","zyxel/atp800 firmware","zyxel/usg20-vpn firmware","zyxel/usg20w-vpn firmware","zyxel/usg40 firmware","zyxel/usg40w firmware","zyxel/usg60 firmware","zyxel/usg60w firmware","zyxel/usg110 firmware","zyxel/usg210 firmware","zyxel/usg310 firmware","zyxel/usg1100 firmware","zyxel/usg1900 firmware","zyxel/usg2200-vpn firmware","zyxel/zywall 110 firmware","zyxel/zywall 310 firmware","zyxel/zywall 1100 firmware","zyxel/vpn50 firmware","zyxel/vpn100 firmware","zyxel/vpn300 firmware"],"epss":{"score":0.2118,"percentile":0.97568,"date":"2026-10-26","history":[{"date":"2026-09-21","score":0.18636,"percentile":0.97199},{"date":"2026-09-22","score":0.2118,"percentile":0.97476}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2019-04-16","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":46706,"kind":"exploit","title":"Zyxel ZyWall 310 / ZyWall 110 / USG1900 / ATP500 / USG40 - Login Page Cross-Site Scripting","url":"https://www.exploit-db.com/exploits/46706","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/webapps/46706.txt","file":"exploits/hardware/webapps/46706.txt","published":"2019-04-16","added":"2019-04-16","updated":"2019-04-16","author":"Aaron Bishop","type":"webapps","platform":"hardware","port":80,"verified":false,"codes":["CVE-2019-9955"],"tags":"Cross-Site Scripting (XSS)","aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 21.2%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://seclists.org/fulldisclosure/2019/Apr/22","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/46706/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/152525/Zyxel-ZyWall-Cross-Site-Scripting.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2019/Apr/22","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/46706/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.securitymetrics.com/blog/Zyxel-Devices-Vulnerable-Cross-Site-Scripting-Login-page","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zyxel.com/support/reflected-cross-site-scripting-vulnerability-of-firewalls.shtml","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-9955","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}