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CVE-2026-27749

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CVE-2026-27749

Published: Mar 5, 2026

Modified: Apr 1, 2026

PUBLISHED

CVSS v3.1

7.8

HIGH

Description

Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component. The Avira.SystemSpeedup.RealTimeOptimizer.exe process, which runs with SYSTEM privileges, deserializes data from a file located in C:\\ProgramData using .NET BinaryFormatter without implementing input validation or deserialization safeguards. Because the file can be created or modified by a local user in default configurations, an attacker can supply a crafted serialized payload that is deserialized by the privileged process, resulting in arbitrary code execution as SYSTEM.

VendorProductVersions

Gen Digital Inc.

Avira Internet Security

affected
0 - <= 1.1.109.1990
unaffected
1.1.114.3113

Weaknesses (CWE)

CWE-502

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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