What is CVE-2026-20449?

CVE-2026-20449 is a medium-severity vulnerability in Mediatek Mt2735, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2026-05-04.

How severe is CVE-2026-20449?

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

Buffer overflow in Mediatek Mt2735

CVE-2026-20449

In Modem, there is a possible system crash due to a heap buffer overflow. 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 needed…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (8.7th 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

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

security@mediatek.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20449?: CVE-2026-20449 is a medium-severity vulnerability in Mediatek Mt2735, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2026-05-04.
How severe is CVE-2026-20449?: Medium severity. CVSS v3 base score is 6.5 out of 10.