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CVE-2026-27750

7.8 · HIGH

Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component.

Published Mar 5, 2026CWE-367EPSS 0.14%

Overview

CVE-2026-27750 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 time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component. A privileged service running as SYSTEM identifies directories for cleanup during a scan phase and subsequently deletes them during a separate cleanup phase without revalidating the target path. A local attacker can replace a previously scanned directory with a junction or reparse point before deletion occurs, causing the privileged process to delete an unintended system location. This may result in deletion of protected files or directories and can lead to local privilege escalation, denial of service, or system integrity compromise depending on the affected target.

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-2026-27750?

CVE-2026-27750 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-2026-27750?

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-2026-27750?

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-2026-27750?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27750 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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