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Fencer Intel
critical 9.1

CVE-2019-12583 in the critical feed json

Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate gues…

published 7y ago modified 4mo ago also EUVD-2019-4177

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
43.9%
EPSS 43.9% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator. This can lead to unauthorised network access or Denial of Service.

Patch / fix

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Exploit prediction

43.93% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Nuclei template Zyxel ZyWall UAG/USG - Account Creation Access nuclei detection template
  • 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 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:N/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.