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CVE-2026-27749

7.8 · HIGH

Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component.

Published Mar 5, 2026CWE-502EPSS 0.77%

Overview

CVE-2026-27749 is a high-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsupport.avira.com/hc/en-us/articles/360010656158-Current-Avira-versionsRefwww.avira.com/en/internet-securityRefwww.gendigital.com/us/en/contact-us/security-advisories/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27749?

CVE-2026-27749 is a high-severity vulnerability. It was published on March 5, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-27749?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-27749?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27749?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27749 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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