CVE-2019-12581: zyxel uag2100_firmware Cross-site Scripting
Vulnerability summary
CVE-2019-12581 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in zyxel uag2100_firmware. EPSS estimates a 6.40% chance of exploitation in the next 30 days, higher than 93.6% of scored vulnerabilities. 2 public exploits are recorded.
Timeline
- 27-06-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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 metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
6.40%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
-0.68 pp
From 7.08% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (sec-consult.com)
Maturity: unknown
Exploit Reference (n-thumann.de)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Zyxel9 products
- uag2100_firmware≤ 4.18\(aaiz.1\)c0
- uag4100_firmware≤ 4.18\(aatd.1\)c0
- uag5100_firmware≤ 4.18\(aapn.1\)c0
- usg110_firmware≤ 4.30
- usg1100_firmware≤ 4.30
1 vendor · 9 products
References
4 links- www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtmlX Refsource CONFIRMPatchVendor Advisory
- sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.htmlX Refsource MISCExploitPatchThird Party Advisory
- n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/X Refsource MISCExploitThird Party Advisory