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TI-2026-22109 Aliases CVE-2026-27749GHSA-w8px-r6g2-r3wp

Avira Internet Security System Speedup Insecure Deserialization

Priority HIGH 69CWE-502Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00356 29th percentileScored 2026-11-07
Fix Fixed Avira Internet Security (Gen Digital Inc.): 1.1.114.3113

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Gen DigitalAvira Internet Securityup to 1.1.109.19901.1.114.3113Patch availableCNA
  • Avira Internet Security VendorGen Digital Affected up to 1.1.109.1990 Fixed in 1.1.114.3113 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:*before 1.1.114.3113VulnerableGen Digital
  • cpe:2.3:a:avira:internet_security:*:*:*:*:*:windows:*:* Versions before 1.1.114.3113 Vulnerable ·Gen Digital

Remediation

  • Fix · CNA Avira Internet Security (Gen Digital Inc.) Fixed in 1.1.114.3113

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27749
  2. 2026-10-03 Alias added: GHSA-w8px-r6g2-r3wp
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

Other 2

  • TI-2026-22110 Avira Internet Security Optimizer TOCTOU CVSS 3.1HIGH 7.8
  • TI-2026-22108 Avira Internet Security Arbitrary File Deletion via Improper Link Resolution CVSS 3.1HIGH 7.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences