How severe is CVE-2019-16889?

CVE-2019-16889 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-16889 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16889?

CVE-2019-16889 primarily affects Ui Er-x Firmware. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-16889?

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

When was CVE-2019-16889 published?

CVE-2019-16889 was published on 2019-09-25 and last updated on 2026-06-17.

CVE-2019-16889

CVE-2019-16889 is a high-severity vulnerability in Ui Er-x Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Ui Er-x Firmware
Published: 2019-09-25
Last modified: 2026-06-17

Description

Ubiquiti EdgeMAX devices before 2.0.3 allow remote attackers to cause a denial of service (disk consumption) because *.cache files in /var/run/beaker/container_file/ are created when providing a valid length payload of 249 characters or fewer to the beaker.session.id cookie in a GET header. The attacker can use a long series of unique session IDs.

Frequently asked questions

What is CVE-2019-16889?: Ubiquiti EdgeMAX devices before 2.0.3 allow remote attackers to cause a denial of service (disk consumption) because *.cache files in /var/run/beaker/container_file/ are created when providing a valid length payload of 249 characters or fewer to the beaker.session.id cookie in a GET header. The attacker can use a long series of unique session IDs.
How severe is CVE-2019-16889?: CVE-2019-16889 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-16889 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16889?: CVE-2019-16889 primarily affects Ui Er-x Firmware. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-16889?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-16889 published?: CVE-2019-16889 was published on 2019-09-25 and last updated on 2026-06-17.

References

Affected products (12)

cpe:2.3:o:ui:er-x_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-x-sfp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:ep-r6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:erlite-3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:erpoe-5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-8_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:erpro-8_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:ep-r8_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-6p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-12_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ui:er-8-xg_firmware:*:*:*:*:*:*:*:*

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