Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Avira | Internet Security | < 1.1.114.3113 |
Related Weaknesses (CWE)
References
- https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versionsRelease Notes
- https://www.avira.com/en/internet-securityProduct
- https://www.gendigital.com/us/en/contact-us/security-advisories/
FAQ
What is CVE-2026-27750?
CVE-2026-27750 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 ...
How severe is CVE-2026-27750?
CVE-2026-27750 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27750?
Check the references section above for vendor advisories and patch information. Affected products include: Avira Internet Security.