high7.8
CVE-2026-27749
Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Avira | Internet Security | before 1.1.114.3113 |