CVE-2026-27750

Published: Mar 05, 2026 Last Modified: Mar 13, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,5
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
HIGH 7,8
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0001
Percentile
0,0th
Updated

EPSS Score Trend (Last 10 Days)

367

Time-of-check Time-of-use (TOCTOU) Race Condition

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Other Non-Repudiation
Potential Impacts:
Alter Execution Logic Unexpected State Modify Application Data Modify Files Or Directories Modify Memory Other Hide Activities
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: Medium
View CWE Details
Application

Internet Security by Avira

Product Information
Vendor Avira
Product Internet Security
Version Range Affected
To 1.1.114.3113 (exclusive)
cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://blog.quarkslab.com/avira-deserialize-delete-and-esc…
https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way…
https://support.avira.com/hc/en-us/articles/360010656158-Cu…
https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions
https://www.avira.com/en/internet-security
https://www.avira.com/en/internet-security
https://www.vulncheck.com/advisories/avira-internet-securit…
https://www.vulncheck.com/advisories/avira-internet-security-optimizer-toctou