Avira Internet Security Optimizer TOCTOU

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-27750
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-05 15:16:12 UTC
Updated2026-04-01 15:22:36 UTC
DescriptionAvira 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000110000 probability, percentile 0.012130000 (date 2026-04-01)

Problem Types: CWE-367 | CWE-367 CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Avira Internet Security All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gen Digital Inc. Avira Internet Security affected 1.1.109.1990 semver Windows
CNA Gen Digital Inc. Avira Internet Security unaffected 1.1.114.3113 semver Windows

References

ReferenceSourceLinkTags
www.gendigital.com/us/en/contact-us/security-advisories [email protected] www.gendigital.com
www.avira.com/en/internet-security [email protected] www.avira.com Product
support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions [email protected] support.avira.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade Avira Internet Security for Windows to version 1.1.114.3113 or later. Apply updates through the product's built-in updater or a fresh install from the vendor; see the release-notes reference in this record for current supported versions.

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