CVE-2026-27749
High · 7.8CVSS
7.8
EPSS
0.8%
Published
Mar 5, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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