How severe is CVE-2018-9149?

CVE-2018-9149 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-9149 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9149?

CVE-2018-9149 affects Zyxel Ac3000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9149?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-9149 published?

CVE-2018-9149 was published on 2018-04-01 and last updated on 2026-06-17.

CVE-2018-9149

CVE-2018-9149 is a medium-severity vulnerability in Zyxel Ac3000 Firmware with a CVSS 3.x base score of 6.8. 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-798.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Zyxel Ac3000 Firmware
Published: 2018-04-01
Last modified: 2026-06-17

Description

The Zyxel Multy X (AC3000 Tri-Band WiFi System) device doesn't use a suitable mechanism to protect the UART. After an attacker dismantles the device and uses a USB-to-UART cable to connect the device, he can use the 1234 password for the root account to login to the system. Furthermore, an attacker can start the device's TELNET service as a backdoor.

Frequently asked questions

What is CVE-2018-9149?: The Zyxel Multy X (AC3000 Tri-Band WiFi System) device doesn't use a suitable mechanism to protect the UART. After an attacker dismantles the device and uses a USB-to-UART cable to connect the device, he can use the 1234 password for the root account to login to the system. Furthermore, an attacker can start the device's TELNET service as a backdoor.
How severe is CVE-2018-9149?: CVE-2018-9149 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-9149 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9149?: CVE-2018-9149 affects Zyxel Ac3000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9149?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-9149 published?: CVE-2018-9149 was published on 2018-04-01 and last updated on 2026-06-17.

References

https://www.slideshare.net/secret/qrHwDOJ71eLg7f

Affected products (1)

cpe:2.3:o:zyxel:ac3000_firmware:-:*:*:*:*:*:*:*

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