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UK Cyber Defence
VulnerabilityAnalyzed

CVE-2026-20541

In Modem, there is a possible out of bounds read due to a missing permission check.

MEDIUM 5.3EPSS 0.18%

Does this matter?

Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.

Description

In Modem, there is a possible out of bounds read due to a missing permission check. 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. User interaction is not needed for exploitation. Patch ID: MOLY01774038; Issue ID: MSV-8911.

CVSS 3.1
5.3 MEDIUMCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.18% probability · 8th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-126
Affected
mediatek/mt6985 firmware · mediatek/mt6986 firmware · mediatek/mt6988 firmware · mediatek/mt6989 firmware · mediatek/mt6990 firmware · mediatek/mt6991 firmware · mediatek/mt6993 firmware · mediatek/mt8666 firmware · mediatek/mt8667 firmware · mediatek/mt8668 firmware · mediatek/mt8673 firmware · mediatek/mt8675 firmware · mediatek/mt8676 firmware · mediatek/mt8678 firmware · mediatek/mt8755 firmware · mediatek/mt8765 firmware · mediatek/mt8766 firmware · mediatek/mt8766r firmware · mediatek/mt8768 firmware · mediatek/mt8771 firmware · +40 more
Source
security@mediatek.com
EPSS trend
0%3%5%5 October 2026: 0.18%26 October 2026: 0.18%5 October 202626 October 2026

EPSS moved from 0.2% on 5 October 2026 to 0.2% on 26 October 2026.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.