CVE-2019-12583

9.1 CRITICAL 44% exploit odds Drop everything Fix listed Auth & access Network gear

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering, service disruption.
Exploit odds: 43.9% chance of exploitation in the next 30 days (EPSS). Higher than most.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2019-06-02 00:00 UTC ReservedThe CVE id was reserved by its CNA
2019-06-27 14:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:14 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 43.9% in the next 30 days (EPSS).
Severity: 9.1 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2019-06-27 14:15 UTC
Last modified: 2026-06-17 02:14 UTC
Exploit probability: 43.9% · EPSS, next 30 days
Weakness: CWE-425
Record status: Modified

Affected

Zyxel uag2100 Firmware ≤ 4.18\(aaiz.1\)c0
Zyxel uag4100 Firmware ≤ 4.18\(aatd.1\)c0
Zyxel uag5100 Firmware ≤ 4.18\(aapn.1\)c0
Zyxel usg110 Firmware ≤ 4.33\(aaph.0\)c0
Zyxel usg210 Firmware ≤ 4.33\(aapi.0\)c0
Zyxel usg310 Firmware ≤ 4.33\(aapj.0\)c0
Zyxel usg1100 Firmware ≤ 4.33\(aapk.0\)c0
Zyxel usg1900 Firmware ≤ 4.33\(aapl.0\)c0

Attack profile CVSS 3.0 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: High

Raw vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record