Vulnerability · Published Mar 5, 2026 · Assigned by VulnCheck
CVE-2026-27749Avira Internet Security System Speedup Insecure Deserialization
High 7.8
In plain English
A high-severity unsafe deserialization in Avira Internet Security from Gen Digital Inc.. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Gen Digital Inc. | Avira Internet Security | 0 – through 1.1.109.1990 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H