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Samsung Mobile Devices CVE-2026-21071

| EUVDEUVD-2026-55096 MEDIUM
Improper Input Validation (CWE-20)
2026-08-10 SamsungMobile GHSA-q2h3-fgc6-2gqw
Buffer Overflow Samsung Mobile Devices
5.1
CVSS 4.0 · Vendor: SamsungMobile
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Severity by source

Vendor (SamsungMobile) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.8 MEDIUM

Local vector confirmed by description; PR:N because any unprivileged process invokes the codec; S:C reflects cross-component memory impact observed in SC/SI/SA of CVSS 4.0.

3.1 AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 10, 2026 - 09:08 vuln.today
CVE Published
Aug 10, 2026 - 07:41 cve.org
MEDIUM 5.1

DescriptionCVE.org

Improper input validation in MPEG4 codec in libsavsvc.so prior to SMR Aug-2026 Release 1 allows local attackers to write out-of-bounds memory.

AnalysisAI

Out-of-bounds memory write in Samsung Mobile Devices' MPEG4 codec library libsavsvc.so enables local attackers with no special privileges to corrupt memory, potentially leading to code execution or service disruption across affected system components. All Samsung Mobile Devices running firmware prior to SMR Aug-2026 Release 1 are exposed via this improper input validation flaw in the proprietary media codec. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires local code execution on the target Samsung device - the attacker must have an application or process running locally (AV:L confirmed by CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 reflects a moderate risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Samsung Security Maintenance Release (SMR) Aug-2026 Release 1 by updating device firmware via Settings > Software Update on affected Samsung devices - this is the only confirmed fix per the vendor advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-21071 vulnerability details – vuln.today
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