CVE-2025-20634

Description

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote code execution, 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: MOLY01289384; Issue ID: MSV-2436.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
mediatek	nr16	All
mediatek	nr17	All
mediatek	nr17r	All
mediatek	mt2737	All
mediatek	mt6813	All
mediatek	mt6835	All
mediatek	mt6835t	All
mediatek	mt6878	All
mediatek	mt6878m	All
mediatek	mt6879	All
mediatek	mt6886	All
mediatek	mt6895	All
mediatek	mt6895tt	All
mediatek	mt6896	All
mediatek	mt6897	All
mediatek	mt6899	All
mediatek	mt6980	All
mediatek	mt6980d	All
mediatek	mt6983	All
mediatek	mt6983t	All
mediatek	mt6985	All
mediatek	mt6985t	All
mediatek	mt6989	All
mediatek	mt6989t	All
mediatek	mt6990	All
mediatek	mt6991	All
mediatek	mt8673	All
mediatek	mt8676	All
mediatek	mt8678	All
mediatek	mt8795t	All
mediatek	mt8798	All
mediatek	mt8863	All

References

Advisories & Patches

https://corp.mediatek.com/product-security-bulletin/February-2025

Frequently Asked Questions

What is CVE-2025-20634? +

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote code execution, 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: MOLY01289384; Issue ID: MSV-2436. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-20634? +

CVE-2025-20634 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-20634? +

CVE-2025-20634 affects products from mediatek, specifically: mt2737, mt6813, mt6835, mt6835t, mt6878, mt6878m, mt6879, mt6886, mt6895, mt6895tt, mt6896, mt6897, mt6899, mt6980, mt6980d, mt6983, mt6983t, mt6985, mt6985t, mt6989, mt6989t, mt6990, mt6991, mt8673, mt8676, mt8678, mt8795t, mt8798, mt8863, nr16, nr17, nr17r. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-20634? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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