What is CVE-2026-20420?

CVE-2026-20420 is a medium-severity vulnerability in Mediatek Mt2735, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-02-02.

How severe is CVE-2026-20420?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Mediatek Mt2735

CVE-2026-20420

In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges need…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (11.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mediatek Mt2735
Mediatek Mt2737
Mediatek Mt6813
Mediatek Mt6815
Mediatek Mt6833
Mediatek Mt6835
Mediatek Mt6853
Mediatek Mt6855
Mediatek Mt6858
Mediatek Mt6873

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20420?: CVE-2026-20420 is a medium-severity vulnerability in Mediatek Mt2735, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-02-02.
How severe is CVE-2026-20420?: Medium severity. CVSS v3 base score is 6.5 out of 10.