CVE-2019-12581
A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices allows remote attackers to inject arbitrary web script or HTML via the err_msg parameter.
Does this matter?
Lower severity and a low EPSS score (6.40%). Track it; it rarely justifies an emergency change on its own.
Description
A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices allows remote attackers to inject arbitrary web script or HTML via the err_msg parameter.
- CVSS 3.0
- 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 6.40% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- zyxel/uag2100 firmware · zyxel/uag4100 firmware · zyxel/uag5100 firmware · zyxel/usg110 firmware · zyxel/usg210 firmware · zyxel/usg310 firmware · zyxel/usg1100 firmware · zyxel/usg1900 firmware · zyxel/usg2200-vpn firmware
- Source
- cve@mitre.org
EPSS 6.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/Exploit, Third Party Advisory
- https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.htmlExploit, Patch, Third Party Advisory
- https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtmlPatch, Vendor Advisory
- https://www.zyxel.com/us/en/Vendor Advisory
- https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/Exploit, Third Party Advisory
- https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.htmlExploit, Patch, Third Party Advisory
- https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtmlPatch, Vendor Advisory
- https://www.zyxel.com/us/en/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.