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CVE-2026-27749— Avira Internet Security System Speedup Insecure Deserialization

CVSS 7.8 · High EPSS 0.07% · P21
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I. Basic Information for CVE-2026-27749

Vulnerability Information
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Vulnerability Title
Avira Internet Security System Speedup Insecure Deserialization
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)
Vulnerability Title
Avira Internet Security 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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System Speedup组件反序列化不可信数据，可能导致本地攻击者以SYSTEM权限执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Gen Digital Inc.Avira Internet Security 0 ~ 1.1.109.1990 -

II. Public POCs for CVE-2026-27749

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III. Intelligence Information for CVE-2026-27749

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Same Patch Batch · Gen Digital Inc. · 2026-03-05 · 3 CVEs total

CVE-2026-277487.8 HIGHAvira Internet Security Arbitrary File Deletion via Improper Link Resolution
CVE-2026-277507.8 HIGHAvira Internet Security Optimizer TOCTOU

IV. Related Vulnerabilities

Same product: Avira Internet Security
Same vendor: Gen Digital Inc.
Same weakness: CWE-502

V. Comments for CVE-2026-27749

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