CVE-2026-27749: CWE-502 Deserialization of Untrusted Data in Gen Digital Inc. Avira Internet Security
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.
AI Analysis
Technical Summary
CVE-2026-27749 is a deserialization of untrusted data vulnerability (CWE-502) in Gen Digital Inc.'s Avira Internet Security, specifically in the System Speedup component. The vulnerable executable, Avira.SystemSpeedup.RealTimeOptimizer.exe, runs with SYSTEM privileges and deserializes data from a file located in C:\ProgramData using .NET BinaryFormatter without input validation or safeguards. Because this file can be created or modified by a local user under default settings, an attacker with local access can supply a malicious serialized payload. When deserialized by the privileged process, this leads to arbitrary code execution with SYSTEM privileges.
Potential Impact
Successful exploitation allows a local attacker to execute arbitrary code with SYSTEM privileges on the affected system. This can lead to full system compromise, including confidentiality, integrity, and availability impacts. The vulnerability is rated high severity with a CVSS score of 7.8, reflecting the ease of exploitation by a local attacker and the high impact of code execution at the SYSTEM level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local user permissions to prevent unauthorized modification or creation of files in C:\ProgramData related to Avira System Speedup. Monitor vendor communications for updates on patches or official mitigations.
CVE-2026-27749: CWE-502 Deserialization of Untrusted Data in Gen Digital Inc. Avira Internet Security
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-27749 is a deserialization of untrusted data vulnerability (CWE-502) in Gen Digital Inc.'s Avira Internet Security, specifically in the System Speedup component. The vulnerable executable, Avira.SystemSpeedup.RealTimeOptimizer.exe, runs with SYSTEM privileges and deserializes data from a file located in C:\ProgramData using .NET BinaryFormatter without input validation or safeguards. Because this file can be created or modified by a local user under default settings, an attacker with local access can supply a malicious serialized payload. When deserialized by the privileged process, this leads to arbitrary code execution with SYSTEM privileges.
Potential Impact
Successful exploitation allows a local attacker to execute arbitrary code with SYSTEM privileges on the affected system. This can lead to full system compromise, including confidentiality, integrity, and availability impacts. The vulnerability is rated high severity with a CVSS score of 7.8, reflecting the ease of exploitation by a local attacker and the high impact of code execution at the SYSTEM level.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local user permissions to prevent unauthorized modification or creation of files in C:\ProgramData related to Avira System Speedup. Monitor vendor communications for updates on patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-02-23T21:38:48.842Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69a993803bbe47dd19a952a2
Added to database: 3/5/2026, 2:30:24 PM
Last enriched: 4/4/2026, 10:35:49 AM
Last updated: 4/19/2026, 11:11:34 AM
Views: 62
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.