CVE-2026-27749

HIGH

7.8

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.

CVE Details

CVSS v3.1 Score7.8

SeverityHIGH

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published3/5/2026

Last Modified4/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

avira:internet_security

Weaknesses (CWE)

CWE-502

References

https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions(security@nortonlifelock.com)

https://www.avira.com/en/internet-security(security@nortonlifelock.com)

https://www.gendigital.com/us/en/contact-us/security-advisories/(security@nortonlifelock.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.