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Samsung Exynos Modem SMS Processing Out-of-Bounds Write Due to TP-UDHI Header Mismatch, Affecting Processors from Exynos 980 Through Exynos 2500 and Multiple Modem Generations

Last refreshed2026-09-28

Status: UPDATED  |  Advisory ID: CVE-2025-62818

Key Details

CVECVE-2025-62818
CVSS Score / Version9.8 (Critical) / CVSS v3.1
Updated2026-06-17
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Proseattack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected productssee table below
Classified asCWE-787 (Out-of-bounds Write)

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
Samsungexynos_990_firmware
Samsungexynos_980_firmware
Samsungexynos_850_firmware
Samsungexynos_1080_firmware
Samsungexynos_1280_firmware
Samsungexynos_1330_firmware
Samsungexynos_1380_firmware
Samsungexynos_1480_firmware
Samsungexynos_1580_firmware
Samsungexynos_2100_firmware
Samsungexynos_2200_firmware
Samsungexynos_2400_firmware
Samsungexynos_2500_firmware
Samsungexynos_w930_firmware
Samsungexynos_w920_firmware
Samsungexynos_w1000_firmware
Samsungexynos_modem_5400_firmware
Samsungexynos_modem_5300_firmware
Samsungexynos_modem_5123_firmware
Samsungexynos_9110_firmware
SubsystemsGeneral OT
SectorsMultiple

What to Know

An issue was discovered in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, 1580, 2500, 9110, W920, W930, W1000, Modem 5123, Modem 5300, and Modem 5400. An out-of-bounds write occurs due to a mismatch between the TP-UDHI and UDL values when processing an SMS TP-UD packet. (NVD)

What to Do

Monitor Samsung's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-62818
CVEhttps://www.cve.org/CVERecord?id=CVE-2025-62818
Vendor advisoryhttps://semiconductor.samsung.com/support/quality-support/product-security-updates/