What is CVE-2019-18989?

CVE-2019-18989 is a medium-severity vulnerability in Mediatek Mt7620n, classified under Authentication Bypass by Spoofing. CVSS score: 5.4/10. Published 2020-09-30.

How severe is CVE-2019-18989?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Mediatek Mt7620n

CVE-2019-18989

A partial authentication bypass vulnerability exists on Mediatek MT7620N 1.06 devices. The vulnerability allows sending an unencrypted data frame to a WPA2-protected WLAN router where the packet is routed through the network. If successful, a response is sent back as an encrypted frame, which would allow an attacker to discern information or potentially modify data.

Published 2020-09-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Mediatek Mt7620n
Mediatek Mt7620n Firmware — versions 1.06

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

www.synopsys.com/blogs/software-security/cyrc-advisory-sept2020/ (Third Party Advisory)

Frequently asked questions

What is CVE-2019-18989?: CVE-2019-18989 is a medium-severity vulnerability in Mediatek Mt7620n, classified under Authentication Bypass by Spoofing. CVSS score: 5.4/10. Published 2020-09-30.
How severe is CVE-2019-18989?: Medium severity. CVSS v3 base score is 5.4 out of 10.