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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Fri, 13 Mar 2026 01:30:00 +0000

Type Values Removed Values Added
First Time appeared Avira internet Security
CPEs cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:*
Vendors & Products Avira internet Security

Fri, 06 Mar 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Gen Digital
Gen Digital avira Internet Security
Vendors & Products Gen Digital
Gen Digital avira Internet Security

Fri, 06 Mar 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Avira
Avira avira Internet Security Suite
CPEs cpe:2.3:a:avira:avira_internet_security_suite:*:*:*:*:*:windows:*:*
Vendors & Products Avira
Avira avira Internet Security Suite

Thu, 05 Mar 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Thu, 05 Mar 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title Avira Internet Security System Speedup Insecure Deserialization
Weaknesses CWE-502
References
Metrics cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-03-06T18:17:15.860Z

Reserved: 2026-02-23T21:38:48.842Z

Link: CVE-2026-27749

cve-icon Vulnrichment

Updated: 2026-03-06T18:17:12.528Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-05T15:16:11.963

Modified: 2026-03-13T01:21:04.073

Link: CVE-2026-27749

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-06T15:07:38Z

Weaknesses