CVE-2019-12581 json
A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG device…
published 2019-06-27 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-4175
- cvss
- 6.1
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.4%
- EPSS 6.4% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
Exploit prediction
6.40% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting nuclei detection template
- sec-consult.com https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.html referenced PoC, tagged "exploit" by a source, unverified
- n-thumann.de https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 6.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
zyxel.com
/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
patch, vendor-advisory
-
sec-consult.com
/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.html
exploit, patch, third-party-advisory
-
n-thumann.de
/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
exploit, third-party-advisory
-
zyxel.com
/us/en/
vendor-advisory
Sources
- CVE List CVE-2019-12581
- NVD CVE-2019-12581
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