In sec boot, there is a possible out of bounds write due to an integer overflow.

published 2026-04-07 7mo ago modified 2026-06-17 4mo ago also EUVD-2026-19569

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits: 0; none known

In sec boot, there is a possible out of bounds write due to an integer overflow. This could lead to local denial of service, if an attacker has physical access to the device, with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS09963054; Issue ID: MSV-3899.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7mo ago (2026-04-07)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.3	CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	4.3	CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	4.3	CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

MediaTek, Inc. MediaTek chipset

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-190 Integer Overflow or Wraparound

References

corp.mediatek.com /product-security-bulletin/April-2026
vendor-advisory

Sources

CVE List CVE-2026-20446
NVD CVE-2026-20446

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