How severe is CVE-2018-15557?

CVE-2018-15557 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-15557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15557?

CVE-2018-15557 affects Actiontec Web6000q Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-15557?

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-2018-15557 published?

CVE-2018-15557 was published on 2019-06-27 and last updated on 2026-06-17.

CVE-2018-15557

CVE-2018-15557 is a high-severity vulnerability in Actiontec Web6000q Firmware with a CVSS 3.x base score of 8.8. 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-269.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Actiontec Web6000q Firmware
Published: 2019-06-27
Last modified: 2026-06-17

Description

An issue was discovered in the Quantenna WiFi Controller on Telus Actiontec WEB6000Q v1.1.02.22 devices. An attacker can statically set his/her IP to anything on the 169.254.1.0/24 subnet, and obtain root access by connecting to 169.254.1.2 port 23 with telnet/netcat.

Frequently asked questions

What is CVE-2018-15557?: An issue was discovered in the Quantenna WiFi Controller on Telus Actiontec WEB6000Q v1.1.02.22 devices. An attacker can statically set his/her IP to anything on the 169.254.1.0/24 subnet, and obtain root access by connecting to 169.254.1.2 port 23 with telnet/netcat.
How severe is CVE-2018-15557?: CVE-2018-15557 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-15557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15557?: CVE-2018-15557 affects Actiontec Web6000q Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-15557?: 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-2018-15557 published?: CVE-2018-15557 was published on 2019-06-27 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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CVE-2018-15555 — Critical (CVSS 9.8): On Telus Actiontec WEB6000Q v1.1.02.22 devices, an attacker can login with root level access with the user "root" and…
CVE-2018-15556 — Critical (CVSS 9.8): The Quantenna WiFi Controller on Telus Actiontec WEB6000Q v1.1.02.22 allows login with root level access with the user…

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