CVE-2026-27749

HIGH EPSS 24.0%
Published Mar 5, 20263mo ago · Modified Apr 1, 20263mo ago
7.8 CVSS 3.1
High
Find Similar
Published Mar 5, 2026 3mo ago
Last Modified Apr 1, 2026 3mo ago

Description

Avira Internet Security contains a deserialization of untrusted data vulnerability in the System Speedup component. The Avira.SystemSpeedup.RealTimeOptimizer.exe process, which runs with SYSTEM privileges, deserializes data from a file located in C:\\ProgramData using .NET BinaryFormatter without implementing input validation or deserialization safeguards. Because the file can be created or modified by a local user in default configurations, an attacker can supply a crafted serialized payload that is deserialized by the privileged process, resulting in arbitrary code execution as SYSTEM.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
24.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

Affected Products 1

VendorProductVersionRange
avirainternet_security* <1.1.114.3113

References 3

  • support.avira.com https://support.avira.com/hc/en-us/articles/360010656158-Current-Avira-versions
    Release Notes
  • avira.com https://www.avira.com/en/internet-security
    Product
  • gendigital.com https://www.gendigital.com/us/en/contact-us/security-advisories/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.