How severe is CVE-2019-12583?

CVE-2019-12583 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2019-12583 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12583?

CVE-2019-12583 primarily affects Zyxel Uag2100 Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12583?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-12583 published?

CVE-2019-12583 was published on 2019-06-27 and last updated on 2026-06-17.

CVE-2019-12583

CVE-2019-12583 is a critical-severity vulnerability in Zyxel Uag2100 Firmware with a CVSS 3.x base score of 9.1. Its EPSS exploit-prediction score of 44% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-425.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 44% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-425
Affected product: Zyxel Uag2100 Firmware
Published: 2019-06-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2019-12583?: 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.
How severe is CVE-2019-12583?: CVE-2019-12583 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2019-12583 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12583?: CVE-2019-12583 primarily affects Zyxel Uag2100 Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12583?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-12583 published?: CVE-2019-12583 was published on 2019-06-27 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:o:zyxel:uag2100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:uag4100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:uag5100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:usg2200-vpn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_110_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_1100_firmware:*:*:*:*:*:*:*:*

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