CVE-2026-27750— Avira Internet Security Optimizer TOCTOU

Avira Internet Security Optimizer TOCTOU

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

检查时间与使用时间(TOCTOU)的竞争条件

Avira Internet Security 安全漏洞

Avira Internet Security是德国Avira公司的一款网络安全防护软件。 Avira Internet Security存在安全漏洞，该漏洞源于Optimizer组件存在竞争条件，可能导致本地攻击者删除受保护文件或目录，进而引发本地权限提升、拒绝服务或系统完整性破坏。

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