How severe is CVE-2018-15555?

CVE-2018-15555 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-15555 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15555?

CVE-2018-15555 affects Actiontec Web6000q Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-15555?

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-2018-15555 published?

CVE-2018-15555 was published on 2019-06-28 and last updated on 2026-06-17.

CVE-2018-15555

CVE-2018-15555 is a critical-severity vulnerability in Actiontec Web6000q Firmware with a CVSS 3.x base score of 9.8. 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-662.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-662
Affected product: Actiontec Web6000q Firmware
Published: 2019-06-28
Last modified: 2026-06-17

Description

On Telus Actiontec WEB6000Q v1.1.02.22 devices, an attacker can login with root level access with the user "root" and password "admin" by using the enabled onboard UART headers.

Frequently asked questions

What is CVE-2018-15555?: On Telus Actiontec WEB6000Q v1.1.02.22 devices, an attacker can login with root level access with the user "root" and password "admin" by using the enabled onboard UART headers.
How severe is CVE-2018-15555?: CVE-2018-15555 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-15555 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15555?: CVE-2018-15555 affects Actiontec Web6000q Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-15555?: 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-2018-15555 published?: CVE-2018-15555 was published on 2019-06-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:actiontec:web6000q_firmware:1.1.02.22:*:*:*:*:*:*:*

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