A partial authentication bypass vulnerability exists on Mediatek MT7620N 1.06 devices.

published 2020-09-30 6y ago modified 2026-06-17 4mo ago also EUVD-2019-8643

cvss: 6.1; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

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.

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Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	6.1	CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/UI:N
NVD	3.1	5.4	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA	3.0	6.1	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
NVD	2.0	4.8	AV:A/AC:L/Au:N/C:P/I:P/A:N

Classification

Weakness

CWE-290 Authentication Bypass by Spoofing

References

synopsys.com /blogs/software-security/cyrc-advisory-sept2020/
third-party-advisory

Sources

CVE List CVE-2019-18989
NVD CVE-2019-18989

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